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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 2 Months Ended 10 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Cash flow from operating activities:        
Net (loss) income $ (502,964) $ (21,068) $ 43,539 $ 147,102
Adjustments to reconcile net (income) loss to net cash provided by (used in) operating activities:        
Depreciation, depletion and amortization 28,149 68,478 106,006 86,271
Amortization of debt issuance costs 416 1,988 5,059 5,430
Impairment of oil and gas properties 0 0 51,081 0
Stock-based compensation expense 0 1,851 8,647 6,750
Deferred income taxes 9 1,888 (36,778) 43,946
Increase (decrease) in allowance for doubtful accounts 0 970 153 (20)
Other operating expenses (income) (25) (22,930) 5,518 (2,747)
Reorganization expenses, net (non-cash) 501,872 0 0 (25,523)
Derivatives activities:        
Total losses (gains) (12,886) 66,900 44,955 (1,735)
Cash settlements on derivatives 534 3,068 42,197 (38,482)
Cash payments on early-terminated derivatives 0 0 0 (126,949)
Changes in assets and liabilities:        
(Increase) decrease in accounts receivable (9,152) (7,022) (14,597) (1,683)
(Increase) decrease in other assets (2,842) (13,175) (5,136) (819)
Increase (decrease) in accounts payable and accrued expenses 18,330 6,619 (917) 19,526
(Decrease) increase in other liabilities 990 19,832 (7,898) (5,596)
Net cash provided by operating activities 22,431 107,399 241,829 105,471
Cash flow from investing activities:        
Development of oil and natural gas properties (247) (50,229) (219,176) (94,225)
Changes in capital investment accruals (2,249) (2,483) 12,814 (20,371)
Purchases of other property and equipment (662) (12,767) (16,792) (15,056)
Acquisition of properties and equipment 0 (249,338) (2,840) 0
Proceeds from sale of property and equipment and other 25 234,292 969 8,212
Net cash (used in) investing activities (3,133) (80,525) (225,025) (121,440)
Cash flow from financing activities:        
Dividends paid on common stock 0 0 (39,157) (7,365)
Purchase of treasury stock 0 0 (46,909) (23,351)
Shares withheld for payment of taxes on equity awards 0 0 (1,268) (3,699)
Issuance of 2026 Senior Unsecured Notes 0 0 0 400,000
Debt issuance costs 0 (22,170) 0 (9,193)
IPO proceeds net of issuance costs 0 0 0 133,805
Repurchase of common stock 0 0 0 (23,712)
Payment to preferred stockholders in conversion 0 0 0 (60,273)
Dividends paid on Series A preferred stock 0 0 0 (11,301)
Proceeds from sale of Series A Preferred Stock 335,000 0 0 0
Net cash (used in) provided by financing activities (162,668) (43,170) (85,484) 15,911
Net decrease in cash and cash equivalents (143,370) (16,296) (68,680) (58)
Cash, cash equivalents and restricted cash:        
Beginning 228,404 85,034 68,680 68,738
Ending 85,034 68,738 0 68,680
RBL Facility        
Cash flow from financing activities:        
Borrowings under credit facility 0 402,285 355,132 203,510
Repayments on credit facility 0 (23,285) (353,282) (582,510)
Emergence Credit Facility        
Cash flow from financing activities:        
Borrowings under credit facility 0 51,000 0 0
Repayments on credit facility 0 (451,000) 0 0
Pre-Emergence Credit Facility        
Cash flow from financing activities:        
Repayments on credit facility $ (497,668) $ 0 $ 0 $ 0