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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities    
Net loss $ (98,634) $ (11,966)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depletion, depreciation and amortization 135,024 102,959
Deferred income taxes 51,867 37,176
Unsuccessful well costs 19,357 87,845
Non-cash change in fair value of derivatives 13,847 16,946
Cash settlements on derivatives (18,755) (4,779)
Equity-based compensation 58,215 29,264
Doubtful accounts expense   (39,782)
Loss on extinguishment of debt   59,643
Other 7,739 1,939
Changes in assets and liabilities:    
(Increase) decrease in receivables 89,102 (40,279)
(Increase) decrease in inventories (7,812) 2,126
(Increase) decrease in prepaid expenses and other 4,112 (2,455)
Increase (decrease) in accounts payable (127,025) 33,729
Increase (decrease) in accrued liabilities 23,073 (5,220)
Net cash provided by operating activities 150,110 267,146
Investing activities    
Oil and gas assets (272,681) (282,098)
Other property (9,030) (1,928)
Notes receivable   4,448
Restricted cash (23,089) 85,551
Net cash used in investing activities (304,800) (194,027)
Financing activities    
Borrowings under long-term debt   1,393,000
Payments on long-term debt (110,000) (1,438,000)
Net proceeds from the initial public offering   580,374
Purchase of treasury stock (8,378)  
Deferred financing costs (374) (52,466)
Net cash provided by (used in) financing activities (118,752) 482,908
Net increase (decrease) in cash and cash equivalents (273,442) 556,027
Cash and cash equivalents at beginning of period 673,092 100,415
Cash and cash equivalents at end of period 399,650 656,442
Cash paid for:    
Interest 30,247 36,854
Income taxes $ 16,620 $ 850