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Consolidated statements of cash flows - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income (loss) $ 68,276 $ (180,371)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depletion, depreciation and amortization 34,112 41,478
Impairment expense 0 161,064
Non-cash stock-based compensation, net of amounts capitalized 9,224 3,838
Mark-to-market on derivatives:    
Gain on derivatives, net (36,671) (17,885)
Cash settlements received for matured derivatives, net 7,451 65,937
Cash settlements received for early terminations of derivatives, net 0 80,000
Change in net present value of derivative deferred premiums 41 72
Cash premiums paid for derivatives (2,107) (81,850)
Amortization of debt issuance costs 1,053 1,120
Income from equity method investee (3,068) (2,298)
Cash settlement of performance unit awards 0 (6,394)
Other, net 1,212 1,006
Decrease in accounts receivable 7,996 2,526
Increase in other assets (1,591) (2,186)
Increase in accounts payable 9,684 9,201
Increase (decrease) in undistributed revenues and royalties 171 (8,258)
Decrease in other accrued liabilities (31,955) (10,414)
Decrease in other noncurrent liabilities (44) (69)
Net cash provided by operating activities 63,784 56,517
Capital expenditures:    
Oil and natural gas properties (110,542) (105,155)
Midstream service assets (1,731) (1,937)
Other fixed assets (1,203) (630)
Investment in equity method investee 0 (26,660)
Proceeds from dispositions of capital assets, net of selling costs 59,515 218
Net cash used in investing activities (53,961) (134,164)
Cash flows from financing activities:    
Borrowings on Senior Secured Credit Facility 50,000 85,000
Payments on Senior Secured Credit Facility (55,000) (25,000)
Purchase of treasury stock (7,501) (1,412)
Proceeds from exercise of employee stock options 358 0
Net cash (used in) provided by financing activities (12,143) 58,588
Net decrease in cash and cash equivalents (2,320) (19,059)
Cash and cash equivalents, beginning of period 32,672 31,154
Cash and cash equivalents, end of period $ 30,352 $ 12,095