Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Additional Information (Details)

v3.10.0.1
Long-Term Debt - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended 25 Months Ended
Oct. 18, 2018
Sep. 07, 2016
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 18, 2018
Jun. 30, 2017
Debt Instrument [Line Items]                          
Aggregate annual maturities of long-term debt, 2019             $ 0   $ 0        
Aggregate annual maturities of long-term debt, 2020             0   0        
Aggregate annual maturities of long-term debt, 2021             0   0        
Aggregate annual maturities of long-term debt, 2022             21,000,000   21,000,000        
Aggregate annual maturities of long-term debt, 2023             625,000,000   625,000,000        
Debt instrument aggregate principal amount             646,000,000   646,000,000 $ 889,790,000      
Investment in Second Lien Term Loan $ 5,000,000                     $ 5,000,000  
Gain on exchange of debt             47,100,000 $ 7,800,000 $ 47,109,000 $ 7,811,000 $ 123,923,000    
Refinancing Transaction                          
Debt Instrument [Line Items]                          
Gain on exchange of debt 47,100,000                        
Basic and diluted income (loss) per common share                 $ 0.33        
Exchange Transaction                          
Debt Instrument [Line Items]                          
Gain on exchange of debt                     $ 123,900,000    
Basic and diluted income (loss) per common share                   $ 0.06 $ 1.30    
Deal transaction costs   $ 18,900,000                      
Common stock issued value per share   $ 1.76                      
Additional expense charged to gain on debt transactions                   $ 400,000      
Exchange Transaction | Common Stock                          
Debt Instrument [Line Items]                          
Debt conversion, common stock shares issued   60.4                      
9.75% Senior Second Lien Notes, Due November 2023                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount $ 625,000,000           $ 625,000,000   $ 625,000,000     $ 625,000,000  
Debt instrument interest rate 9.75%           9.75%   9.75% 9.75%   9.75%  
Debt instrument maturity date Nov. 01, 2023               Nov. 01, 2023 Nov. 01, 2023      
Debt instrument payment terms Interest on the Senior Second Lien Notes is payable in arrears on May 1 and November 1 of each year, beginning on May 1, 2019.                        
Annual effective interest rate 10.30%                     10.30%  
Senior second lien notes repurchase price limit percentage 101.00%                     101.00%  
Krohn entities purchase of Senior Second Lien Notes $ 8,000,000                        
9.75% Senior Second Lien Notes, Due November 2023 | Prior to November 1, 2020                          
Debt Instrument [Line Items]                          
Redemption price percentage of principal amount plus accrued and unpaid interest 100.00%                        
Redemption description                 Prior to November 1, 2020, we may redeem all or any portion of the Senior Second Lien Notes at a redemption price equal to 100% of the principal amount of the outstanding Senior Second Lien Notes plus accrued and unpaid interest, if any, to the redemption date, plus the “Applicable Premium” (as defined in the Indenture). In addition, prior to November 1, 2020, we may, at our option, on one or more occasions redeem up to 35% of the aggregate original principal amount of the Senior Second Lien Notes in an amount not greater than the net cash proceeds from certain equity offerings at a redemption price of 109.750% of the principal amount of the outstanding Senior Second Lien Notes plus accrued and unpaid interest, if any, to the redemption date.        
Redemption price percentage of principal amount plus accrued and unpaid interest redeemable upon proceeds from equity offering 109.75%                        
9.75% Senior Second Lien Notes, Due November 2023 | Prior to November 1, 2020 | Maximum                          
Debt Instrument [Line Items]                          
Redemption price percentage 35.00%                        
9.75% Senior Second Lien Notes, Due November 2023 | 12-month Period Beginning November 1, 2020                          
Debt Instrument [Line Items]                          
Redemption price percentage of principal amount plus accrued and unpaid interest 104.875%                        
9.75% Senior Second Lien Notes, Due November 2023 | 12-month Period Beginning November 1, 2021                          
Debt Instrument [Line Items]                          
Redemption price percentage of principal amount plus accrued and unpaid interest 102.438%                        
9.75% Senior Second Lien Notes, Due November 2023 | On November 1, 2022 and Thereafter                          
Debt Instrument [Line Items]                          
Redemption price percentage of principal amount plus accrued and unpaid interest 100.00%                        
Credit Facility, Due October 2022                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount             $ 21,000,000   $ 21,000,000        
Debt instrument maturity date                 Oct. 18, 2022        
Credit agreement expiration date Oct. 18, 2022                        
Initial borrowing base and lending commitment $ 250,000,000                     $ 250,000,000  
Leverage ratio             350.00%            
Estimated derivative contracts projected date Dec. 02, 2018                        
Estimated derivative contracts projected production period 18 months                        
Credit facility borrowings outstanding             $ 21,000,000   $ 21,000,000 $ 0      
Letters of credit outstanding             $ 9,600,000   $ 9,600,000 300,000      
Credit Facility, Due October 2022 | Letters of Credit                          
Debt Instrument [Line Items]                          
Credit facility maximum lender commitment $ 30,000,000                     30,000,000  
Credit Facility, Due October 2022 | Scenario, Forecast                          
Debt Instrument [Line Items]                          
Leverage ratio     300.00% 325.00% 325.00% 350.00%              
Credit Facility, Due October 2022 | Two Quarters After Material Acquisition                          
Debt Instrument [Line Items]                          
Leverage ratio                 350.00%        
Credit Facility, Due October 2022 | Maximum                          
Debt Instrument [Line Items]                          
Unused portion of the borrowing base commitment fee 0.50%                        
Credit Facility, Due October 2022 | Maximum | Eurodollar                          
Debt Instrument [Line Items]                          
Debt instrument, basis spread on variable rate 3.50%                        
Credit Facility, Due October 2022 | Maximum | Alternate Base Rate                          
Debt Instrument [Line Items]                          
Debt instrument, basis spread on variable rate 2.50%                        
Credit Facility, Due October 2022 | Minimum                          
Debt Instrument [Line Items]                          
Credit agreement, current ratio 100.00%                        
Unused portion of the borrowing base commitment fee 0.375%                        
Estimated percenatge of derivative contracts 50.00%                        
Credit Facility, Due October 2022 | Minimum | Eurodollar                          
Debt Instrument [Line Items]                          
Debt instrument, basis spread on variable rate 2.50%                        
Credit Facility, Due October 2022 | Minimum | Alternate Base Rate                          
Debt Instrument [Line Items]                          
Debt instrument, basis spread on variable rate 1.50%                        
11.00% 1.5 Lien Term Loan, Due November 2019 | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount $ 75,000,000                     $ 75,000,000  
Debt instrument interest rate 11.00%                     11.00%  
Debt instrument maturity date Nov. 15, 2019                        
Debt instrument, maturity date, description “1.5 Lien Term Loan”) due November 15, 2019                        
9.00% Term Loan, due May 15, 2020 | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount $ 300,000,000                     $ 300,000,000  
Debt instrument interest rate 9.00%                     9.00%  
Debt instrument maturity date May 15, 2020                        
Debt instrument, maturity date, description 9.00% Term Loan, due May 15, 2020                        
9.00 % Second Lien Term Loan, Due May 2020                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount                   $ 300,000,000      
Debt instrument interest rate             9.00%   9.00% 9.00%      
Debt instrument maturity date                 May 15, 2020 May 15, 2020      
9.00 % Second Lien Term Loan, Due May 2020 | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount $ 177,500,000                     $ 177,500,000  
Debt instrument maturity date May 15, 2020                        
Debt instrument, maturity date, description 9.00%/10.75% Senior Second Lien PIK Toggle Notes (the “Second Lien PIK Toggle Notes”), due May 15, 2020                        
9.00 % Second Lien Term Loan, Due May 2020 | Maximum | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument paid in kind interest rate 10.75%                     10.75%  
9.00 % Second Lien Term Loan, Due May 2020 | Minimum | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument interest rate 9.00%                     9.00%  
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount                   $ 153,192,000      
Debt instrument interest rate             8.50%   8.50% 8.50%      
Debt instrument maturity date                 Jun. 15, 2021 Jun. 15, 2021      
Debt instrument paid in kind interest rate             10.00%   10.00% 10.00%      
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount $ 160,900,000                     $ 160,900,000  
Debt instrument maturity date Jun. 15, 2021                        
Debt instrument, maturity date, description 8.50%/10.00% Senior Third Lien PIK Toggle Notes (the “Third Lien PIK Toggle Notes”), due June 15, 2021                        
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 | Exchange Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount   $ 142,000,000                      
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 | Maximum | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument paid in kind interest rate 10.00%                     10.00%  
8.50%/10.00% Third Lien PIK Toggle Notes, Due June 2021 | Minimum | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument interest rate 8.50%                     8.50%  
8.50% Unsecured Senior Notes, Due June 2019                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount                   $ 189,829,000      
Debt instrument interest rate             8.50%   8.50% 8.50%      
Debt instrument maturity date                 Jun. 15, 2019 Jun. 15, 2019      
8.50% Unsecured Senior Notes, Due June 2019 | Refinancing Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount $ 189,800,000                     $ 189,800,000  
Debt instrument interest rate 8.50%                     8.50%  
Debt instrument maturity date Jun. 15, 2019                        
Debt instrument, maturity date, description 8.500% Senior Notes (the “Unsecured Senior Notes”), due June 15, 2019                        
8.50% Unsecured Senior Notes, Due June 2019 | Exchange Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount   $ 710,200,000                      
Percentage of unsecured senior notes exchanged   79.00%                      
8.50% Unsecured Senior Notes, Due June 2019 | Exchange Transaction | Common Stock                          
Debt Instrument [Line Items]                          
Debt conversion, common stock shares issued   60.4                      
9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount                   $ 171,769,000      
Debt instrument interest rate             9.00%   9.00% 9.00%      
Debt instrument maturity date                 May 15, 2020 May 15, 2020      
Debt instrument paid in kind interest rate             10.75%   10.75% 10.75%      
9.00%/10.75% Second Lien PIK Toggle Notes, Due May 2020 | Exchange Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount   $ 159,800,000                      
11.00% 1.5 Lien Term Loan, Due November 2019                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount                   $ 75,000,000      
Debt instrument interest rate             11.00%   11.00% 11.00%      
Debt instrument maturity date                 Nov. 15, 2019 Nov. 15, 2019      
11.00% 1.5 Lien Term Loan, Due November 2019 | Exchange Transaction                          
Debt Instrument [Line Items]                          
Debt instrument aggregate principal amount   $ 75,000,000                      
1.5 Lien Term Loan | Exchange Transaction                          
Debt Instrument [Line Items]                          
Interest expense recorded for new debt                       $ 0  
Second Lien PIK Toggle Notes and the Third Lien PIK Toggle Notes                          
Debt Instrument [Line Items]                          
Net reduction to long term debt                         $ 8,200,000