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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (531,259) $ (216,224)
Adjustments to reconcile net loss to net cash provided by operating activities    
Depreciation, depletion and amortization 172,862 101,579
Accretion of asset retirement obligations 9,779 2,607
Debt issuance costs amortization 3,008 2,538
Amortization of discount, net of premium, on long-term debt 672 635
Loss on extinguishment of debt 82,005 0
Deferred income taxes 4,359 0
Unrealized loss on derivative contracts 22,417 127,836
Loss on sale of assets 398,174 3,080
Stock-based compensation 19,850 11,371
Other (299) (385)
Changes in operating assets and liabilities (56,921) 77,787
Net cash provided by operating activities 121,457 230,910
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures for property, plant and equipment (421,876) (601,841)
Acquisition of assets (5,048) (10,511)
Proceeds from sale of assets 2,559,374 269,008
Net cash provided by (used in) investing activities 2,132,450 (343,344)
CASH FLOWS FROM FINANCING ACTIVITIES    
Repayments of borrowings (1,115,500) (257)
Premium on debt redemption (61,997) 0
Debt issuance costs (91) (7,223)
Proceeds from the sale of royalty trust units 0 98,849
Noncontrolling interest distributions (51,256) (32,740)
Stock-based compensation excess tax benefit 0 7
Purchase of treasury stock (12,041) (7,144)
Dividends paid - preferred (17,263) (17,263)
Cash received (paid) on settlement of financing derivative contracts 3,208 (1,634)
Net cash (used in) provided by financing activities (1,254,940) 32,595
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 998,967 (79,839)
CASH AND CASH EQUIVALENTS, beginning of year 309,766 207,681
CASH AND CASH EQUIVALENTS, end of period 1,308,733 127,842
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest, net of amounts capitalized (127,181) (57,174)
Cash received for income taxes 476 83
Supplemental Disclosure of Noncash Investing and Financing Activities    
Deposit on pending sale (255,000) 0
Change in accrued capital expenditures (33,164) (32,183)
Change in preferred stock dividends payable (3,382) (3,382)
Adjustment to oil and natural gas properties for estimated contract loss 0 10,000
Asset retirement costs capitalized 1,102 1,377
Amended
    
Adjustments to reconcile net loss to net cash provided by operating activities    
Realized (gain) loss on derivative contracts 0 117,108
Financing
    
Adjustments to reconcile net loss to net cash provided by operating activities    
Realized (gain) loss on derivative contracts $ (3,190) $ 2,978