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CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income (loss) $ 508,407 $ (160,843) $ (757,744)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Net (gain) loss on divestiture activity (426,917) 131,028 (37,074)
Depletion, depreciation, amortization, and asset retirement obligation liability accretion 665,313 557,036 790,745
Impairment of proved properties 0 3,806 354,614
Abandonment and impairment of unproved properties 49,889 12,272 80,367
Stock-based compensation expense 23,908 22,700 26,897
Net derivative (gain) loss (161,832) 26,414 250,633
Derivative settlement gain (loss) (135,803) 21,234 329,478
Amortization of debt discount and deferred financing costs 15,258 16,276 9,938
(Gain) loss on extinguishment of debt 26,740 35 (15,722)
Deferred income taxes 141,708 (192,066) (448,643)
Other, net 287 7,885 (9,931)
Changes in current assets and liabilities:      
Accounts receivable (30,152) 13,997 (10,562)
Prepaid expenses and other (729) (1,953) 8,478
Accounts payable and accrued expenses 23,819 44,985 (53,210)
Accrued derivative settlements 20,733 12,584 34,540
Net cash provided by operating activities 720,629 515,390 552,804
Cash flows from investing activities:      
Net proceeds from the sale of oil and gas properties 748,509 776,719 946,062
Capital expenditures (1,303,188) (888,353) (629,911)
Acquisition of proved and unproved oil and gas properties (33,255) (89,896) (2,183,790)
Net cash used in investing activities (587,934) (201,530) (1,867,639)
Cash flows from financing activities:      
Proceeds from credit facility 0 406,000 947,000
Repayment of credit facility 0 (406,000) (1,149,000)
Net proceeds from Senior Notes 492,079 0 491,640
Cash paid to repurchase senior notes, including premium (845,002) (2,357) (29,904)
Net proceeds from Senior Convertible Notes 0 0 166,617
Cash paid for capped call transactions 0 0 (24,195)
Net proceeds from sale of common stock 3,187 2,623 938,268
Dividends paid (11,191) (11,144) (7,751)
Other, net (7,746) (1,411) (5,486)
Net cash provided by (used in) financing activities (368,673) (12,289) 1,327,189
Net change in cash, cash equivalents, and restricted cash (235,978) 301,571 12,354 [1]
Cash, cash equivalents, and restricted cash at beginning of period 313,943 12,372 [1] 18 [1]
Cash, cash equivalents, and restricted cash at end of period 77,965 313,943 12,372 [1]
Supplemental Cash Flow Information - Operating Activities [Abstract]      
Cash paid for interest, net of capitalized interest (150,727) (164,097) (129,761)
Net cash (refunded) paid for income taxes 2,995 5,986 (4,690)
Supplemental Cash Flow Information - Investing Activities [Abstract]      
Changes in capital expenditure accruals and other (2,774) 7,309 8,044
Supplemental Cash Flow Information - Non-Cash Investing Activities [Abstract]      
Carrying value of properties exchanged 95,121   733
Supplemental Cash Flow Information - Non-Cash Financing Activities [Abstract]      
Issuance of common stock for an asset acquisition [2] 0 0 437,194
Non-cash (gain) loss on extinguishment of debt, net $ 6,334 $ 22 $ (15,722)
[1] (1) Cash, cash equivalents, and restricted cash for the year ended December 31, 2016, includes $3.0 million of restricted cash which is included in other noncurrent assets on the accompanying balance sheets.
[2] (1) Refer to Note 3 – Divestitures, Assets Held for Sale, and Acquisitions and Note 13 – Equity for additional discussion.