Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Details)

v3.19.1
Long-Term Debt - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 18, 2018
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
May 02, 2019
Dec. 31, 2018
Credit Agreement Borrowings              
Debt Instrument [Line Items]              
Credit agreement expiration date Oct. 18, 2022            
Initial borrowing base and lending commitment           $ 250,000  
Letters of credit issued and outstanding         $ 8,100   $ 9,600
Leverage ratio         350.00%    
Debt instrument interest rate         5.10%    
Credit Agreement Borrowings | Minimum              
Debt Instrument [Line Items]              
Credit agreement, current ratio 100.00%            
Credit Agreement Borrowings | Scenario, Forecast              
Debt Instrument [Line Items]              
Leverage ratio   300.00% 325.00% 325.00%      
Credit Agreement Borrowings | Two Quarters After Material Acquisition              
Debt Instrument [Line Items]              
Leverage ratio         350.00%    
Credit Agreement Borrowings | Letters of Credit              
Debt Instrument [Line Items]              
Initial borrowing base and lending commitment $ 30,000            
Senior Second Lien Notes              
Debt Instrument [Line Items]              
Debt instrument interest rate 9.75%            
Debt instrument aggregate principal amount $ 625,000       $ 625,000   $ 625,000
Debt instrument maturity date 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%