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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 40,758 $ 50,974
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 75,435 84,575
Accretion expense 8,263 8,266
Deferred income tax provision 27,024 27,439
Settlement of asset retirement obligations (14,880) (2,980)
Non-cash stock compensation expense 2,296 1,750
Excess tax benefits (104) (847)
Non-cash derivative expense 1,385 1,342
Non-cash interest expense 4,041 1,573
Change in current income taxes (9,402) (2,647)
(Increase) decrease in accounts receivable 19,952 (22,111)
Decrease in other current assets 40 35
Decrease in inventory 158  
Increase (decrease) in accounts payable 2,004 (6,015)
Decrease in other current liabilities (8,942) (22,168)
Other (1,262) (254)
Net cash provided by (used in) operating activities 146,766 118,932
Cash flows from investing activities:    
Investment in oil and gas properties (160,968) (106,469)
Proceeds from sale of oil and gas properties, net of expenses   403
Sale of fixed assets   134
Investment in fixed and other assets (599) (909)
Net cash used in investing activities (161,567) (106,841)
Cash flows from financing activities:    
Proceeds from bank borrowings   25,000
Repayments of bank borrowings   (70,000)
Proceeds from issuance of senior convertible notes   300,000
Deferred financing costs of senior convertible notes   (8,855)
Proceeds from Sold Warrants   40,170
Payments for Purchased Call Options   (70,830)
Deferred financing costs (11)  
Excess tax benefits 104 847
Net payments for share based compensation (3,465) (3,033)
Net cash (used in) provided by financing activities (3,372) 213,299
Net change in cash and cash equivalents (18,173) 225,390
Cash and cash equivalents, beginning of period 279,526 38,451
Cash and cash equivalents, end of period $ 261,353 $ 263,841