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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 107,031 $ 42,824
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation, depletion and amortization 147,418 148,653
Deferred income tax expense 57,603 23,574
(Gain) / loss on sale of assets 1,285 96
Exploration expense 2,040 666
Amortization of debt issuance costs 1,126 897
Stock-based compensation and other 3,029 17,655
Changes in assets and liabilities:    
Accounts receivable, net (23,418) (243)
Income taxes (16,889) 4,349
Inventories 7,076 2,896
Other current assets 1,170 983
Accounts payable and accrued liabilities (16,089) (27,885)
Other assets and liabilities 39 358
Stock-based compensation tax benefit (16,043) (2,138)
Net cash provided by operating activities 255,378 212,685
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (338,701) (260,169)
Proceeds from sale of assets 108 486
Restricted cash 8,382  
Investment in equity method investment (5,937) (1,250)
Net cash used in investing activities (336,148) (260,933)
CASH FLOWS FROM FINANCING ACTIVITIES    
Borrowings from debt 366,000 135,000
Repayments of debt (291,000) (95,000)
Dividends paid (8,332) (4,201)
Stock-based compensation tax benefit 16,043 2,138
Other 90 32
Net cash provided by financing activities 82,801 37,969
Net increase / (decrease) in cash and cash equivalents 2,031 (10,279)
Cash and cash equivalents, beginning of period 23,400 30,736
Cash and cash equivalents, end of period $ 25,431 $ 20,457