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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net (loss) income $ (34,098) $ 6,410
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 24,585 18,429
Amortization of debt issuance costs 1,255 1,223
Stock-based compensation expense 1,474 1,042
Deferred income taxes (13,098) 939
(Decrease) increase in allowance for doubtful accounts 427 (2)
(Gains) losses on sale of assets and other, net 1,245 0
Reorganization expenses, net (non-cash) 0 (9,000)
Derivative activities:    
Total (gains) losses 63,124 34,644
Cash settlements on derivatives 14,904 (17,849)
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (6,084) 1,163
(Increase) decrease in other assets (2,703) 554
(Decrease) in accounts payable and accrued expenses (29,854) (7,323)
(Decrease) in other liabilities (2,066) (2,638)
Net cash provided by operating activities 19,111 27,592
Cash flows from investing activities:    
Development of oil and natural gas properties (49,386) (14,727)
Purchases of other property and equipment (1,419) (5,149)
Net cash (used in) investing activities (50,805) (19,876)
Cash flows from financing activities:    
Repayments on RBL credit facility (15,350) (379,000)
Borrowings under RBL credit facility 15,350 0
Issuance of 2026 Senior Unsecured Notes 0 400,000
Dividends paid on common stock (9,813)  
Purchase of treasury stock (25,241) 0
Shares withheld for payment of taxes on equity awards and other (270) 0
Debt issuance costs 0 (8,815)
Net cash (used in) provided by financing activities (35,324) 12,185
Net decrease in cash, cash equivalents and restricted cash (67,018) 19,901
Cash, cash equivalents and restricted cash:    
Beginning 68,680 68,738
Ending $ 1,662 $ 88,639