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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 225,451 $ 131,938
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation, depletion and amortization 304,981 300,042
Deferred income tax expense 118,453 69,662
(Gain) / loss on sale of assets 2,781 (180)
Exploration expense 2,154 806
Unrealized (gain) loss on derivative instruments (12,933)  
Amortization of debt issuance costs 2,252 1,842
Stock-based compensation and other 8,689 27,355
Changes in assets and liabilities:    
Accounts receivable, net 9,588 (32,551)
Income taxes (23,352) (4,971)
Inventories 5,554 (4,103)
Other current assets 15 (2,733)
Accounts payable and accrued liabilities (39,084) 9,661
Other assets and liabilities 753 547
Stock-based compensation tax benefit (20,354) (7,348)
Net cash provided by operating activities 584,948 489,967
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (617,613) (524,056)
Proceeds from sale of assets (755) 906
Restricted cash 28,094  
Investment in equity method investments (22,230) (4,250)
Net cash used in investing activities (612,504) (527,400)
CASH FLOWS FROM FINANCING ACTIVITIES    
Borrowings from debt 611,000 325,000
Repayments of debt (565,000) (270,000)
Dividends paid (16,679) (8,407)
Stock-based compensation tax benefit 20,354 7,348
Other 91 33
Net cash provided by financing activities 49,766 53,974
Net increase in cash and cash equivalents 22,210 16,541
Cash and cash equivalents, beginning of period 23,400 30,736
Cash and cash equivalents, end of period $ 45,610 $ 47,277