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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Cash flows from operating activities:              
Net income (loss) $ 42,234 $ (177,568) $ (135,923) $ 317,401 $ (84,946) $ 198,675  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:              
Net gain on divestiture activity 0   (786)   (323) (425,656)  
Depletion, depreciation, amortization, and asset retirement obligation liability accretion 211,125   201,105   595,201 483,343  
Abandonment and impairment of unproved properties 6,337   9,055   25,092 26,615  
Stock-based compensation expense         18,758 17,680  
Net derivative (gain) loss (100,889)   178,026   (3,463) 249,304  
Derivative settlement gain (loss)         23,843 (101,911)  
Amortization of debt discount and deferred financing costs         11,554 11,542  
Loss on extinguishment of debt 0   26,722   0 26,722  
Deferred income taxes 19,617   (36,833)   (13,620) 60,672  
Other, net         (2,291) (2,084)  
Net change in working capital         11,781 (3,725)  
Net cash provided by operating activities         581,586 541,177  
Cash flows from investing activities:              
Net proceeds from the sale of oil and gas properties         12,520 [1] 743,199  
Capital expenditures         (788,642) (1,032,588)  
Acquisition of proved and unproved oil and gas properties         (2,581) (24,571)  
Net cash used in investing activities         (778,703) (313,960)  
Cash flows from financing activities:              
Proceeds from credit facility         1,124,500 0  
Repayment of credit facility         (995,500) 0  
Net proceeds from Senior Notes         0 492,079  
Cash paid to repurchase Senior Notes, including premium         0 (844,984)  
Net proceeds from sale of common stock         1,959 1,881  
Dividends paid         (5,612) (5,584)  
Other, net         (2,684) (7,746)  
Net cash provided by (used in) financing activities         122,663 (364,354)  
Net change in cash, cash equivalents, and restricted cash         (74,454) (137,137)  
Cash, cash equivalents, and restricted cash at beginning of period   $ 77,965   $ 313,943 77,965 313,943 $ 313,943
Cash, cash equivalents, and restricted cash at end of period 3,511   176,806   3,511 176,806 77,965
Supplemental Cash Flow Information - Operating activities:              
Cash paid for interest, net of capitalized interest         (113,122) (124,435)  
Net cash paid for income taxes         (1,469) (9,085)  
Supplemental Cash Flow Information - Investing activities:              
Changes in capital expenditure accruals and other         34,878 19,811  
Supplemental Cash Flow Information - non-cash investing activities:              
Carrying value of properties exchanged         70,808 95,121  
Supplemental Cash Flow Information - non-cash financing activities:              
Non-cash loss on extinguishment of debt, net         0 6,334  
Reconciliation of cash, cash equivalents, and restricted cash:              
Cash and cash equivalents 10   176,806   10 176,806 $ 77,965
Restricted cash $ 3,501 [1]   $ 0   $ 3,501 [1] $ 0  
[1]
(1) 
As of September 30, 2019, a portion of net proceeds from the sale of oil and gas properties was restricted for future property acquisitions. Restricted cash is included in the other noncurrent assets line item on the accompanying unaudited condensed consolidated balance sheets (“accompanying balance sheets”).