Quarterly report pursuant to Section 13 or 15(d)

Supplemental Guarantor Information - Condensed Consolidating Balance Sheet (Details)

v3.8.0.1
Supplemental Guarantor Information - Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 07, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Current assets:            
Cash and cash equivalents $ 130,711   $ 99,058   $ 126,095 $ 70,236
Receivables:            
Oil and natural gas sales 44,942   45,443      
Joint interest 17,835   19,754      
Income taxes 65,103 $ 13,000 13,006      
Total receivables 127,880   78,203      
Prepaid expenses and other assets 20,197   13,419 $ 20,197    
Total current assets 278,788   190,680      
Oil and natural gas properties and other, net 573,352   579,016      
Restricted deposits for asset retirement obligations 25,622   25,394      
Income taxes receivable   $ 52,100 52,097      
Other assets 64,414   60,393      
Total assets 942,176   907,580      
Current liabilities:            
Accounts payable 77,444   83,665      
Undistributed oil and natural gas proceeds 22,273   20,129      
Asset retirement obligations 25,748   23,613      
Long-term debt 22,858   22,925      
Accrued liabilities 23,293   17,930      
Total current liabilities 171,616   168,262      
Long-term debt:            
Principal 889,790   889,790      
Carrying value adjustments 77,691   79,337      
Long term debt, less current portion - carrying value 967,481   969,127      
Asset retirement obligations, less current portion 280,735   276,833      
Other liabilities 66,993   66,866      
Shareholders’ deficit:            
Common stock 1   1      
Additional paid-in capital 547,039   545,820      
Retained earnings (deficit) (1,067,522)   (1,095,162)      
Treasury stock, at cost (24,167)   (24,167)      
Total shareholders' equity (deficit) (544,649)   (573,508)      
Total liabilities and shareholders' equity (deficit) 942,176   907,580      
Parent Company            
Current assets:            
Cash and cash equivalents 130,711   99,058   $ 126,095 $ 70,236
Receivables:            
Oil and natural gas sales 3,842   5,665      
Joint interest 17,835   19,754      
Income taxes 186,134   128,835      
Total receivables 207,811   154,254      
Prepaid expenses and other assets 14,592   11,154      
Total current assets 353,114   264,466      
Oil and natural gas properties and other, net 406,308   430,354      
Restricted deposits for asset retirement obligations 25,622   25,394      
Income taxes receivable     52,097      
Other assets 577,871   505,304      
Total assets 1,362,915   1,277,615      
Current liabilities:            
Accounts payable 70,997   76,703      
Undistributed oil and natural gas proceeds 20,598   18,762      
Asset retirement obligations 23,635   22,488      
Long-term debt 22,858   22,925      
Accrued liabilities 23,437   18,058      
Total current liabilities 161,525   158,936      
Long-term debt:            
Principal 889,790   889,790      
Carrying value adjustments 77,691   79,337      
Long term debt, less current portion - carrying value 967,481   969,127      
Asset retirement obligations, less current portion 154,861   152,883      
Other liabilities 617,034   566,375      
Shareholders’ deficit:            
Common stock 1   1      
Additional paid-in capital 547,039   545,820      
Retained earnings (deficit) (1,060,859)   (1,091,360)      
Treasury stock, at cost (24,167)   (24,167)      
Total shareholders' equity (deficit) (537,986)   (569,706)      
Total liabilities and shareholders' equity (deficit) 1,362,915   1,277,615      
Guarantor Subsidiaries            
Receivables:            
Oil and natural gas sales 41,100   39,778      
Total receivables 41,100   39,778      
Prepaid expenses and other assets 3,206   2,265      
Total current assets 44,306   42,043      
Oil and natural gas properties and other, net 128,745   152,464      
Other assets 503,839   453,306      
Total assets 676,890   647,813      
Current liabilities:            
Accounts payable 5,477   6,962      
Undistributed oil and natural gas proceeds 1,675   1,367      
Asset retirement obligations 2,113   1,125      
Accrued liabilities 120,887   115,701      
Total current liabilities 130,152   125,155      
Long-term debt:            
Asset retirement obligations, less current portion 125,862   123,950      
Shareholders’ deficit:            
Additional paid-in capital 704,885   704,885      
Retained earnings (deficit) (284,009)   (306,177)      
Total shareholders' equity (deficit) 420,876   398,708      
Total liabilities and shareholders' equity (deficit) 676,890   647,813      
Non-Guarantor Adjustments            
Receivables:            
Prepaid expenses and other assets 2,399          
Total current assets 2,399          
Oil and natural gas properties and other, net 44,947          
Other assets (46,378)          
Total assets 968          
Current liabilities:            
Accounts payable 970          
Total current liabilities 970          
Long-term debt:            
Asset retirement obligations, less current portion 12          
Shareholders’ deficit:            
Retained earnings (deficit) (14)          
Total shareholders' equity (deficit) (14)          
Total liabilities and shareholders' equity (deficit) 968          
Eliminations            
Receivables:            
Income taxes (121,031)   (115,829)      
Total receivables (121,031)   (115,829)      
Total current assets (121,031)   (115,829)      
Oil and natural gas properties and other, net (6,648)   (3,802)      
Other assets (970,918)   (898,217)      
Total assets (1,098,597)   (1,017,848)      
Current liabilities:            
Accrued liabilities (121,031)   (115,829)      
Total current liabilities (121,031)   (115,829)      
Long-term debt:            
Other liabilities (550,041)   (499,509)      
Shareholders’ deficit:            
Additional paid-in capital (704,885)   (704,885)      
Retained earnings (deficit) 277,360   302,375      
Total shareholders' equity (deficit) (427,525)   (402,510)      
Total liabilities and shareholders' equity (deficit) $ (1,098,597)   $ (1,017,848)