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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income (loss) $ (59,700) $ (545,015)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion and amortization 137,212 194,278
Stock-based compensation expense - equity awards 9,066 11,136
Stock-based compensation expense - liability awards 25,074 0
Impairment and abandonment expense 18,399 630,725
Deferred tax expense (benefit) 0 (85,124)
Net (gain) loss on sale of long-lived assets (36) (243)
Non-cash portion of derivative (gain) loss 45,759 31,415
Amortization of debt issuance costs and debt discount 2,886 2,334
(Gain) loss on extinguishment of debt 22,156 (143,443)
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable (33,483) 36,065
(Increase) decrease in prepaid and other assets (9) 41
Increase (decrease) in accounts payable and other liabilities 12,301 (47,666)
Net cash provided by operating activities 179,625 84,503
Cash flows from investing activities:    
Acquisition of oil and natural gas properties (638) (6,113)
Drilling and development capital expenditures (126,665) (271,389)
Purchases of other property and equipment (471) (811)
Proceeds from sales of oil and natural gas properties 698 1,263
Net cash used in investing activities (127,076) (277,050)
Cash flows from financing activities:    
Proceeds from borrowings under revolving credit facility 320,000 385,000
Repayment of borrowings under revolving credit facility (395,000) (190,000)
Proceeds from issuance of convertible senior notes 170,000 0
Debt issuance costs (6,421) (5,141)
Premiums paid on capped call transactions (14,688) 0
Repayments of Senior Debt (127,073) 0
Proceeds from Stock Options Exercised 15 0
Restricted stock used for tax withholdings (477) (301)
Net cash (used in) provided by financing activities (53,644) 189,558
Net increase (decrease) in cash, cash equivalents and restricted cash (1,095) (2,989)
Cash, cash equivalents and restricted cash, beginning of period 8,339 15,543
Cash, cash equivalents and restricted cash, end of period 7,244 12,554
Supplemental cash flow information    
Cash paid for interest 30,124 36,618
Supplemental non-cash activity    
Accrued capital expenditures included in accounts payable and accrued expenses 53,096 22,474
Asset retirement obligations incurred, including revisions to estimates 66 542
Senior Secured Notes issued in the debt exchange, net of debt discount 0 106,030
Restricted Cash and Cash Equivalents [Abstract]    
Cash and cash equivalents 4,702 7,214
Restricted cash(1) [1] 2,542 5,340
Total cash, cash equivalents and restricted cash 7,244 12,554
Senior Notes Due 2026 | Senior Notes    
Supplemental non-cash activity    
Notes Reduction 0 108,632
Senior Notes Due 2027 | Senior Notes    
Supplemental non-cash activity    
Notes Reduction $ 0 $ 140,840
[1] Included in Prepaid and other current assets and Other noncurrent assets line items in the consolidated balance sheets.