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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income (loss) $ (54,252) $ (165,950)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depletion, depreciation and accretion 32,729 48,167
Full cost ceiling impairment   188,443
Stock-based compensation, net 1,560 1,793
Unrealized loss (gain) on derivative contracts 69,053 (24,029)
Reorganization items, net   (6,440)
Loss (gain) on extinguishment of debt (2,068)  
Accrued settlements on derivative contracts 6,769 474
Other income (expense) (229) 280
Change in assets and liabilities:    
Accounts receivable (8,432) 16,270
Prepaids and other 806 5,053
Accounts payable and accrued liabilities 1,196 (16,183)
Net cash provided by (used in) operating activities 47,132 47,878
Cash flows from investing activities:    
Oil and natural gas capital expenditures (47,204) (96,483)
Proceeds received from sale of oil and natural gas properties 947 3,500
Funds held in escrow and other 9 480
Net cash provided by (used in) investing activities (46,248) (92,503)
Cash flows from financing activities:    
Proceeds from borrowings 145,000 119,209
Repayments of borrowings (148,021) (83,000)
Equity issuance costs and other (290) (32)
Net cash provided by (used in) financing activities (3,311) 36,177
Net increase (decrease) in cash and cash equivalents (2,427) (8,448)
Cash and cash equivalents at beginning of period 4,295 10,275
Cash and cash equivalents at end of period 1,868 1,827
Supplemental cash flow information:    
Cash paid for reorganization items   6,440
Disclosure of non-cash investing and financing activities:    
Asset retirement obligations $ 836 $ (70)