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CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 279,773 $ 131,730 $ 122,408
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation, depletion and amortization 651,052 451,405 343,141
Deferred income tax expense 138,380 80,929 74,744
(Gain) / loss on sale of assets (21,351) (50,635) (63,382)
Exploration expense 808 14,000 13,977
Unrealized (gain) / loss on derivative instruments   494 965
Amortization of debt issuance costs 3,693 5,265 4,381
Stock-based compensation, pension and other 45,863 46,872 52,940
Changes in assets and liabilities:      
Accounts receivable, net (49,398) (58,037) (19,893)
Income taxes 29,002 3,055 (27,345)
Inventories (3,033) 7,104 7,708
Other current assets (428) (1,198) 1,143
Accounts payable and accrued liabilities (22,908) 18,843 8,546
Other assets and liabilities (8,014) 2,266 (17,494)
Stock-based compensation tax benefit (18,913)    
Net cash provided by operating activities 1,024,526 652,093 501,839
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (1,194,739) (927,977) (891,277)
Proceeds from sale of assets 323,501 169,326 403,657
Restricted cash (28,094)    
Investment in equity method investment (18,875) (6,863)  
Net cash used in investing activities (918,207) (765,514) (487,620)
CASH FLOWS FROM FINANCING ACTIVITIES      
Borrowings from debt 955,000 400,000 330,000
Repayments of debt (895,000) (263,000) (355,000)
Treasury stock repurchases (164,634)    
Dividends paid (25,232) (16,757) (12,508)
Stock-based compensation tax benefit 18,913    
Capitalized debt issuance costs (2,750) (5,005) (1,025)
Other 48 (992) (1,724)
Net cash provided by / (used in) financing activities (113,655) 114,246 (40,257)
Net increase / (decrease) in cash and cash equivalents (7,336) 825 (26,038)
Cash and cash equivalents, beginning of period 30,736 29,911 55,949
Cash and cash equivalents, end of period $ 23,400 $ 30,736 $ 29,911