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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 12,747 $ 225,451
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation, depletion and amortization 328,009 304,981
Deferred income tax expense 7,160 118,453
(Gain) loss on sale of assets (59) 2,781
Exploratory dry hole cost 178 2,154
(Gain) loss on derivative instruments (27,304) 2,329
Net cash received (paid) in settlement of derivative instruments 88,730 (15,262)
Amortization of debt issuance costs 2,337 2,252
Stock-based compensation and other 11,602 8,689
Changes in assets and liabilities:    
Accounts receivable, net 99,897 9,588
Income taxes (2,184) (23,352)
Inventories (6,397) 5,554
Other current assets (2,953) 15
Accounts payable and accrued liabilities (65,023) (39,084)
Other assets and liabilities (2,663) 753
Stock-based compensation tax benefit (5,486) (20,354)
Net cash provided by operating activities 438,591 584,948
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (645,092) (617,613)
Acquisitions (16,300) 0
Proceeds from sale of assets 3,002 (755)
Restricted cash 0 28,094
Investment in equity method investments (10,114) (22,230)
Net cash used in investing activities (668,504) (612,504)
CASH FLOWS FROM FINANCING ACTIVITIES    
Borrowings from debt 642,000 611,000
Repayments of debt (399,000) (565,000)
Dividends paid (16,537) (16,679)
Stock-based compensation tax benefit 5,486 20,354
Capitalized debt issuance costs (7,838) 0
Other 79 91
Net cash provided by financing activities 224,190 49,766
Net (decrease) increase in cash and cash equivalents (5,723) 22,210
Cash and cash equivalents, beginning of period 20,954 23,400
Cash and cash equivalents, end of period 15,231 45,610
Supplemental Cash Flow Information [Abstract]    
Change in accrued capital expenditures $ (134,875) $ (32,616)