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CONSOLIDATED STATEMENTS 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 (loss) income $ (514,479) $ 246,571 $ 162,388
Adjustments to reconcile net (loss) income to net cash provided by operating activities      
Depreciation, depletion and amortization 629,868 628,834 370,876
Accretion of asset retirement obligations 36,777 28,996 9,368
Impairment 26,280 316,004 2,825
Debt issuance costs amortization 10,091 14,388 11,372
Amortization of discount, net of premium, on long-term debt 1,036 2,592 2,383
Bargain purchase gain 0 (122,696) 0
Loss on extinguishment of debt 82,005 3,075 38,232
Deferred income tax provision (benefit) 3,842 (100,288) (6,986)
Loss (gain) on derivative contracts 47,123 (241,419) (44,075)
Cash (paid) received on settlement of derivative contracts (5,879) 125,932 (53,536)
Loss (gain) on sale of assets 399,086 3,089 (2,044)
Stock-based compensation 85,270 42,795 38,684
Other 3,929 1,387 5,834
Changes in operating assets and liabilities increasing (decreasing) cash      
Receivables 90,048 (141,534) (61,645)
Costs in excess of billings and contract loss, net (8,396) (89,003) (11,013)
Prepaid expenses (7,934) (5,952) (4,359)
Other current assets 810 (1,586) 1,432
Other assets and liabilities, net 5,777 34,447 (35,773)
Accounts payable and accrued expenses 116,999 121,889 51,522
Asset retirement obligations (133,623) (84,361) (16,531)
Net cash provided by operating activities 868,630 783,160 458,954
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures for property, plant and equipment (1,496,731) (2,146,372) (1,727,106)
Acquisitions of assets (17,028) (840,740) (34,628)
Proceeds from sale of assets 2,584,115 431,167 859,405
Net cash provided by (used in) investing activities 1,070,356 (2,555,945) (902,329)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from borrowings 0 1,850,344 2,033,000
Repayments of borrowings (1,115,500) (366,029) (2,130,293)
Premium on debt redemption (61,997) (844) (30,338)
Debt issuance costs (91) (48,538) (20,326)
Proceeds from issuance of royalty trust units 0 587,086 917,528
Proceeds from the sale of royalty trust units 28,985 139,360 0
Noncontrolling interest distributions (206,470) (181,727) (60,200)
Noncontrolling interest contributions 1,579 0 0
Proceeds from issuance of convertible perpetual preferred stock, net 0 0 (231)
Stock-based compensation excess tax benefit (4) (16) 53
Purchase of treasury stock (32,976) (14,723) (13,796)
Dividends paid—preferred (55,525) (55,525) (56,742)
Cash received on shareholder receivable 1,250 0 0
Cash received (paid) on settlement of financing derivative contracts 6,660 (34,518) 6,538
Net cash (used in) provided by financing activities (1,434,089) 1,874,870 645,193
CASH AND CASH EQUIVALENTS, beginning of year 309,766 207,681 5,863
NET INCREASE IN CASH AND CASH EQUIVALENTS 504,897 102,085 201,818
CASH AND CASH EQUIVALENTS, end of year $ 814,663 $ 309,766 $ 207,681