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CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 131,730 $ 122,408 $ 103,386
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation, depletion and amortization 451,405 343,141 327,083
Impairment of oil and gas properties and other assets     40,903
Deferred income tax expense 80,929 74,744 61,809
(Gain) / loss on sale of assets (50,635) (63,382) (106,294)
Exploration expense 14,000 13,977 11,657
Unrealized (gain) / loss on derivative instruments 494 965 226
Amortization of debt issuance costs 5,265 4,381 3,381
Stock-based compensation, pension and other 46,872 52,940 29,794
Changes in assets and liabilities:      
Accounts receivable, net (58,037) (19,893) (14,125)
Income taxes 3,055 (27,345) 34,866
Inventories 7,104 7,708 (1,677)
Other current assets (1,198) 1,143 3,675
Accounts payable and accrued liabilities 18,843 8,546 (1,488)
Other assets and liabilities 2,266 (17,494) (8,285)
Net cash provided by operating activities 652,093 501,839 484,911
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (927,977) (891,277) (857,251)
Proceeds from sale of assets 169,326 403,657 243,510
Investment in equity method investment (6,863)    
Net cash used in investing activities (765,514) (487,620) (613,741)
CASH FLOWS FROM FINANCING ACTIVITIES      
Borrowings from debt 400,000 330,000 525,000
Repayments of debt (263,000) (355,000) (355,000)
Dividends paid (16,757) (12,508) (12,467)
Capitalized debt issuance costs (5,005) (1,025) (13,821)
Other (992) (1,724) 909
Net cash provided by / (used in) financing activities 114,246 (40,257) 144,621
Net increase / (decrease) in cash and cash equivalents 825 (26,038) 15,791
Cash and cash equivalents, beginning of period 29,911 55,949 40,158
Cash and cash equivalents, end of period $ 30,736 $ 29,911 $ 55,949