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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (134,125) $ 42,028
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Deferred income taxes (30,150) 11,330
Exploration 0 27
Gain on sale of assets (70) 0
Depreciation, depletion and amortization 109,128 110,425
(Gain) loss on derivative financial instruments 21,749 (61,899)
Cash settlements of derivative financial instruments (8,677) 45,416
Amortization of debt discount and issuance costs 8,489 7,199
Stock-based compensation 1,690 1,430
Loss on early retirement of debt 238,539 0
(Increase) decrease in accounts receivable (7,032) 54,297
(Increase) decrease in other current assets 4,778 (3,828)
Decrease in accounts payable and accrued expenses (11,047) (56,306)
Net cash provided by operating activities 193,272 150,119
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (165,751) (143,490)
Proceeds from sales of assets 200 0
Net cash used for investing activities (165,551) (143,490)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on bank credit facility 145,000 57,000
Repayments on bank credit facility (95,000) (57,000)
Issuance of 6.75% Senior Notes (1,257,500) 0
Retirement of 7.50% and 9.75% Senior Notes (1,263,651) 0
Preferred stock dividends paid (4,315) (9,572)
Debt and stock issuance costs (20,092) (47)
Income tax withholdings on equity awards 0 (15)
Net cash provided by (used for) financing activities 19,442 (9,634)
Net increase (decrease) in cash and cash equivalents 47,163 (3,005)
Cash and cash equivalents, beginning of period 30,272 18,532
Cash and cash equivalents, end of period $ 77,435 $ 15,527