Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheets) (Details)

v3.10.0.1
Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Current assets:            
Cash and cash equivalents $ 119,230   $ 119,230   $ 99,557  
Accounts receivable - oil and natural gas sales 140,209   140,209   146,773  
Accounts receivable - joint interest and other 53,619   53,619   35,440  
Total other (income) expense (97,528) $ 37,239 (77,231) $ 64,467    
Accounts receivable - related parties 110   110   0  
Accounts receivable - intercompany         0  
Prepaid expenses and other current assets 10,698   10,698   4,912  
Short-term derivative instruments 20,745   20,745   78,847  
Total current assets 344,611   344,611   365,529  
Property and equipment:            
Oil and natural gas properties 9,749,156   9,749,156   9,169,156  
Other property and equipment 91,207   91,207   86,754  
Accumulated depletion, depreciation, amortization and impairment (4,386,370)   (4,386,370)   (4,153,733)  
Property and equipment, net 5,453,993   5,453,993   5,102,177  
Other assets:            
Equity investments and investments in subsidiaries 218,849   218,849   302,112  
Long-term derivative instruments 7,657   7,657   8,685  
Deferred tax asset 0   0   1,208  
Inventories 9,419   9,419   8,227  
Other assets 19,904   19,904   19,814  
Total other assets 255,829   255,829   340,046  
Total assets 6,054,433   6,054,433   5,807,752  
Current liabilities:            
Accounts payable and accrued liabilities 584,416   584,416   553,609  
Accounts payable - intercompany 0   0   0  
Asset retirement obligation—current 120 195 120 195 120  
Short-term derivative instruments 61,161   61,161   32,534  
Current maturities of long-term debt 639   639   622  
Total current liabilities 646,336   646,336   586,885  
Long-term derivative instruments 17,479   17,479   2,989  
Asset retirement obligation—long-term 76,815 43,934 76,815 43,934 74,980  
Deferred tax liability 2,965   2,965   0  
Other non-current liabilities 740   740   2,963  
Long-term debt, net of current maturities 2,114,899   2,114,899   2,038,321  
Total liabilities 2,859,234   2,859,234   2,706,138  
Stockholders’ equity:            
Common stock 1,733   1,733   1,831  
Paid-in capital 4,317,391   4,317,391   4,416,250  
Accumulated other comprehensive (loss) income (49,406)   (49,406)   (40,539)  
Retained (deficit) earnings (1,074,519)   (1,074,519)   (1,275,928)  
Total stockholders’ equity 3,195,199 2,914,839 3,195,199 2,914,839 3,101,614 $ 2,183,892
Total liabilities and stockholders’ equity 6,054,433   6,054,433   5,807,752  
Reportable Legal Entities | Parent            
Current assets:            
Cash and cash equivalents 80,605   80,605   67,908  
Accounts receivable - oil and natural gas sales 102,746   102,746   112,686  
Accounts receivable - joint interest and other 24,244   24,244   15,435  
Total other (income) expense (176,158) (14,535) (241,744) (33,970)    
Accounts receivable - related parties 110   110      
Accounts receivable - intercompany 628,119   628,119   554,439  
Prepaid expenses and other current assets 8,308   8,308   4,719  
Short-term derivative instruments 20,745   20,745   78,847  
Total current assets 864,877   864,877   834,034  
Property and equipment:            
Oil and natural gas properties 6,921,387   6,921,387   6,562,147  
Other property and equipment 91,156   91,156   86,711  
Accumulated depletion, depreciation, amortization and impairment (4,386,332)   (4,386,332)   (4,153,696)  
Property and equipment, net 2,626,211   2,626,211   2,495,162  
Other assets:            
Equity investments and investments in subsidiaries 2,618,091   2,618,091   2,361,575  
Long-term derivative instruments 7,657   7,657   8,685  
Deferred tax asset         1,208  
Inventories 6,741   6,741   5,816  
Other assets 13,378   13,378   12,483  
Total other assets 2,645,867   2,645,867   2,389,767  
Total assets 6,136,955   6,136,955   5,718,963  
Current liabilities:            
Accounts payable and accrued liabilities 421,911   421,911   416,249  
Accounts payable - intercompany 258,218   258,218   63,373  
Asset retirement obligation—current 120   120   120  
Short-term derivative instruments 61,161   61,161   32,534  
Current maturities of long-term debt 639   639   622  
Total current liabilities 742,049   742,049   512,898  
Long-term derivative instruments 17,479   17,479   2,989  
Asset retirement obligation—long-term 64,364   64,364   63,141  
Deferred tax liability 2,965   2,965      
Other non-current liabilities 0   0   0  
Long-term debt, net of current maturities 2,114,899   2,114,899   2,038,321  
Total liabilities 2,941,756   2,941,756   2,617,349  
Stockholders’ equity:            
Common stock 1,733   1,733   1,831  
Paid-in capital 4,317,391   4,317,391   4,416,250  
Accumulated other comprehensive (loss) income (49,406)   (49,406)   (40,539)  
Retained (deficit) earnings (1,074,519)   (1,074,519)   (1,275,928)  
Total stockholders’ equity 3,195,199   3,195,199   3,101,614  
Total liabilities and stockholders’ equity 6,136,955   6,136,955   5,718,963  
Reportable Legal Entities | Guarantors            
Current assets:            
Cash and cash equivalents 38,624   38,624   31,649  
Accounts receivable - oil and natural gas sales 37,463   37,463   34,087  
Accounts receivable - joint interest and other 29,375   29,375   20,005  
Total other (income) expense (97,719) (2,085) (98,521) (1,302)    
Accounts receivable - related parties 0   0      
Accounts receivable - intercompany 258,216   258,216   63,374  
Prepaid expenses and other current assets 2,390   2,390   193  
Short-term derivative instruments 0   0   0  
Total current assets 366,068   366,068   149,308  
Property and equipment:            
Oil and natural gas properties 2,828,498   2,828,498   2,607,738  
Other property and equipment 51   51   43  
Accumulated depletion, depreciation, amortization and impairment (38)   (38)   (37)  
Property and equipment, net 2,828,511   2,828,511   2,607,744  
Other assets:            
Equity investments and investments in subsidiaries         77,744  
Long-term derivative instruments 0   0   0  
Deferred tax asset         0  
Inventories 2,678   2,678   2,411  
Other assets 6,526   6,526   7,331  
Total other assets 9,204   9,204   87,486  
Total assets 3,203,783   3,203,783   2,844,538  
Current liabilities:            
Accounts payable and accrued liabilities 162,505   162,505   137,361  
Accounts payable - intercompany 627,989   627,989   554,313  
Asset retirement obligation—current 0   0   0  
Short-term derivative instruments 0   0   0  
Current maturities of long-term debt 0   0   0  
Total current liabilities 790,494   790,494   691,674  
Long-term derivative instruments 0   0   0  
Asset retirement obligation—long-term 12,451   12,451   11,839  
Deferred tax liability 0   0      
Other non-current liabilities 740   740   2,963  
Long-term debt, net of current maturities 0   0   0  
Total liabilities 803,685   803,685   706,476  
Stockholders’ equity:            
Common stock 0   0   0  
Paid-in capital 1,915,598   1,915,598   1,915,598  
Accumulated other comprehensive (loss) income 0   0   0  
Retained (deficit) earnings 484,500   484,500   222,464  
Total stockholders’ equity 2,400,098   2,400,098   2,138,062  
Total liabilities and stockholders’ equity 3,203,783   3,203,783   2,844,538  
Reportable Legal Entities | Non-Guarantor            
Current assets:            
Cash and cash equivalents 1   1   0  
Accounts receivable - oil and natural gas sales 0   0   0  
Accounts receivable - joint interest and other 0   0   0  
Total other (income) expense 228 208 558 573    
Accounts receivable - related parties 0   0      
Accounts receivable - intercompany 0   0   0  
Prepaid expenses and other current assets 0   0   0  
Short-term derivative instruments 0   0   0  
Total current assets 1   1   0  
Property and equipment:            
Oil and natural gas properties 0   0   0  
Other property and equipment 0   0   0  
Accumulated depletion, depreciation, amortization and impairment 0   0   0  
Property and equipment, net 0   0   0  
Other assets:            
Equity investments and investments in subsidiaries 49,957   49,957   57,641  
Long-term derivative instruments 0   0   0  
Deferred tax asset         0  
Inventories 0   0   0  
Other assets 0   0   0  
Total other assets 49,957   49,957   57,641  
Total assets 49,958   49,958   57,641  
Current liabilities:            
Accounts payable and accrued liabilities 0   0   0  
Accounts payable - intercompany 128   128   127  
Asset retirement obligation—current 0   0   0  
Short-term derivative instruments 0   0   0  
Current maturities of long-term debt 0   0   0  
Total current liabilities 128   128   127  
Long-term derivative instruments 0   0   0  
Asset retirement obligation—long-term 0   0   0  
Deferred tax liability 0   0      
Other non-current liabilities 0   0   0  
Long-term debt, net of current maturities 0   0   0  
Total liabilities 128   128   127  
Stockholders’ equity:            
Common stock 0   0   0  
Paid-in capital 260,877   260,877   259,307  
Accumulated other comprehensive (loss) income (47,287)   (47,287)   (38,593)  
Retained (deficit) earnings (163,760)   (163,760)   (163,200)  
Total stockholders’ equity 49,830   49,830   57,514  
Total liabilities and stockholders’ equity 49,958   49,958   57,641  
Eliminations            
Current assets:            
Cash and cash equivalents 0   0   0  
Accounts receivable - oil and natural gas sales 0   0   0  
Accounts receivable - joint interest and other 0   0   0  
Total other (income) expense 176,121 $ 53,651 262,476 $ 99,166    
Accounts receivable - related parties 0   0      
Accounts receivable - intercompany (886,335)   (886,335)   (617,813)  
Prepaid expenses and other current assets 0   0   0  
Short-term derivative instruments 0   0   0  
Total current assets (886,335)   (886,335)   (617,813)  
Property and equipment:            
Oil and natural gas properties (729)   (729)   (729)  
Other property and equipment 0   0   0  
Accumulated depletion, depreciation, amortization and impairment 0   0   0  
Property and equipment, net (729)   (729)   (729)  
Other assets:            
Equity investments and investments in subsidiaries (2,449,199)   (2,449,199)   (2,194,848)  
Long-term derivative instruments 0   0   0  
Deferred tax asset         0  
Inventories 0   0   0  
Other assets 0   0   0  
Total other assets (2,449,199)   (2,449,199)   (2,194,848)  
Total assets (3,336,263)   (3,336,263)   (2,813,390)  
Current liabilities:            
Accounts payable and accrued liabilities 0   0   (1)  
Accounts payable - intercompany (886,335)   (886,335)   (617,813)  
Asset retirement obligation—current 0   0   0  
Short-term derivative instruments 0   0   0  
Current maturities of long-term debt 0   0   0  
Total current liabilities (886,335)   (886,335)   (617,814)  
Long-term derivative instruments 0   0   0  
Asset retirement obligation—long-term 0   0   0  
Deferred tax liability 0   0      
Other non-current liabilities 0   0   0  
Long-term debt, net of current maturities 0   0   0  
Total liabilities (886,335)   (886,335)   (617,814)  
Stockholders’ equity:            
Common stock 0   0   0  
Paid-in capital (2,176,475)   (2,176,475)   (2,174,905)  
Accumulated other comprehensive (loss) income 47,287   47,287   38,593  
Retained (deficit) earnings (320,740)   (320,740)   (59,264)  
Total stockholders’ equity (2,449,928)   (2,449,928)   (2,195,576)  
Total liabilities and stockholders’ equity $ (3,336,263)   $ (3,336,263)   $ (2,813,390)