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CONSOLIDATED STATEMENTS 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 $ 246,571 $ 162,388 $ 195,010
Adjustments to reconcile net income to net cash provided by operating activities      
Provision for doubtful accounts 1,735 2,511 129
Depreciation, depletion and amortization 628,834 370,876 316,690
Accretion of asset retirement obligations 28,996 9,368 9,421
Impairment 316,004 2,825 0
Debt issuance costs amortization 14,388 11,372 11,006
Amortization of discount, net of premium, on long-term debt 2,592 2,383 2,153
Bargain purchase gain (122,696) 0 0
Loss on extinguishment of debt 3,075 38,232 0
Deferred income taxes (100,288) (6,986) (447,500)
Unrealized (gain) loss on derivative contracts (217,755) (101,034) 283,604
Loss (gain) on sale of assets 3,089 (2,044) 2,424
Stock-based compensation 42,795 38,684 37,681
Other (1,537) 155 (460)
Changes in operating assets and liabilities increasing (decreasing) cash      
Receivables (141,534) (61,645) (11,480)
Inventories 3,111 (2,998) (238)
Billings and estimated contract loss in excess of costs incurred, net (89,003) (11,013) (61,180)
Other current assets (10,649) 71 8,079
Other assets and liabilities, net 34,447 (35,773) 2,667
Asset retirement obligations (84,361) (16,531) (9,234)
Accounts payable and accrued expenses 121,889 51,522 42,122
Net cash provided by operating activities 783,160 458,954 380,894
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures for property, plant and equipment (2,146,372) (1,727,106) (1,035,137)
Acquisitions, net of cash received of $0, $0 and $39,518, respectively (840,740) (34,628) (138,428)
Proceeds from sale of assets 431,167 859,405 204,951
Deposit received on pending asset sale 0 0 10,000
Refunds of restricted deposits 0 0 5,095
Net cash used in investing activities (2,555,945) (902,329) (953,519)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from borrowings 1,850,344 2,033,000 2,117,914
Repayments of borrowings (366,029) (2,130,293) (1,789,919)
Premium on debt redemption (844) (30,338) 0
Debt issuance costs (48,538) (20,326) (12,540)
Proceeds from issuance of royalty trust units 587,086 917,528 0
Proceeds from the sale of royalty trust units 139,360 0 0
Noncontrolling interest distributions (181,727) (60,200) (3,515)
Noncontrolling interest contributions 0 0 306
Proceeds from issuance of convertible perpetual preferred stock, net 0 (231) 290,704
Stock-based compensation excess tax benefit (16) 53 15
Purchase of treasury stock (14,723) (13,796) (7,169)
Dividends paid - preferred (55,525) (56,742) (28,525)
Cash (paid) received on settlement of financing derivative contracts (34,518) 6,538 3,356
Net cash provided by financing activities 1,874,870 645,193 570,627
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 102,085 201,818 (1,998)
CASH AND CASH EQUIVALENTS, beginning of year 207,681 5,863 7,861
CASH AND CASH EQUIVALENTS, end of year 309,766 207,681 5,863
Amended
      
Adjustments to reconcile net income to net cash provided by operating activities      
Realized (gain) loss on derivative contracts 117,108 0 0
Financing
      
Adjustments to reconcile net income to net cash provided by operating activities      
Realized (gain) loss on derivative contracts $ (13,651) $ 6,591 $ 0