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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES      
Net (loss) income $ (4,321,051) $ 351,898 $ (514,479)
Adjustments to reconcile net (loss) income to net cash provided by operating activities      
Depreciation, depletion and amortization 367,295 493,931 629,868
Accretion of asset retirement obligations 4,477 9,092 36,777
Impairment 4,534,689 192,768 26,280
Debt issuance costs amortization 11,884 9,425 10,091
Amortization of discount, net of premium, on long-term debt 3,130 529 1,036
(Gain) loss on extinguishment of debt (641,131) 0 82,005
Write off of debt issuance costs 7,108 0 0
Deferred income tax provision 0 0 3,842
Loss on long-term debt derivatives 10,377 0 0
Cash paid for early conversion of convertible notes (32,741) 0 0
(Gain) loss on derivative contracts (73,061) (334,011) 47,123
Cash received (paid) on settlement of derivative contracts 327,702 11,796 (5,879)
Loss on settlement of contract 50,976 0 0
Cash paid on settlement of contract (24,889) 0 0
Loss on sale of assets 1,491 10 399,086
Stock-based compensation 18,380 19,994 85,270
Other 1,351 407 3,929
Changes in operating assets and liabilities increasing (decreasing) cash      
Receivables 201,907 (63,492) 90,048
Costs in excess of billings 0 0 11,229
Prepaid expenses 1,148 9,549 (7,934)
Other current assets 12,710 3,164 (3,269)
Other assets and liabilities, net 2,239 (1,132) 5,777
Accounts payable and accrued expenses (86,470) (66,492) 101,453
Asset retirement obligations (3,984) (16,322) (133,623)
Net cash provided by operating activities 373,537 621,114 868,630
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures for property, plant and equipment (879,201) (1,553,332) (1,496,731)
Acquisitions of assets 216,943 18,384 17,028
Proceeds from sale of assets 56,504 714,475 2,584,115
Net cash (used in) provided by investing activities (1,039,640) (857,241) 1,070,356
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from borrowings 2,065,000 0 0
Repayments of borrowings (939,466) 0 (1,115,500)
Premium on debt redemption 0 0 (61,997)
Debt issuance costs (53,244) (3,947) (91)
Proceeds from the sale of royalty trust units 0 22,119 28,985
Noncontrolling interest distributions (138,305) (193,807) (206,470)
Noncontrolling interest contributions 0 0 1,579
Acquisition of ownership interest 0 (2,730) 0
Stock-based compensation excess tax benefit 0 14 (4)
Purchase of treasury stock (3,535) (8,702) (32,976)
Repurchase of common stock 0 (111,827) 0
Dividends paid—preferred (11,262) (55,525) (55,525)
Payment received on shareholder receivable 1,250 1,250 1,250
Cash (paid) received on settlement of financing derivative contracts 0 (44,128) 6,660
Net cash provided by (used in) financing activities 920,438 (397,283) (1,434,089)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 254,335 (633,410) 504,897
CASH AND CASH EQUIVALENTS, beginning of year 181,253 814,663 309,766
CASH AND CASH EQUIVALENTS, end of year $ 435,588 $ 181,253 $ 814,663