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 income (loss)	$ 703,503	$ (707,064)	$ 637,769
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	790,553	814,710	707,966
Impairment of natural gas and oil properties		1,939,734
Deferred income taxes	497,945	(461,828)	409,023
(Gain) loss on derivatives, net of settlement	(21,380)	2,154	(5,600)
Stock-based compensation	13,270	11,795	10,550
Other	(91)	(619)	6,310
Change in assets and liabilities:
Accounts receivable	(86,134)	(35,717)	9,659
Inventories	(5,851)	18,111	(12,975)
Accounts payable	74,229	41,275	11,490
Taxes payable	5,040	22,289	(9,360)
Interest payable	(377)	5,058	610
Advances from partners	(68,918)	(15,163)	2,377
Tax benefit for stock-based compensation			(14,626)
Other assets and liabilities	6,739	19,207	(13,376)
Net cash provided by operating activities	1,908,528	1,653,942	1,739,817
Cash Flows From Investing Activities
Capital investments	(2,252,647)	(2,107,755)	(2,184,474)
Proceeds from sale of property and equipment	18,163	201,101	154,526
Transfers to restricted cash	8,542	(167,788)	(85,055)
Transfers from restricted cash		159,246	85,055
Other	10,166	8,519	5,158
Net cash used in investing activities	(2,215,776)	(1,906,677)	(2,024,790)
Cash Flows From Financing Activities
Payments on current portion of long-term debt	(1,200)	(1,200)	(1,200)
Payments on revolving long-term debt	(3,147,750)	(2,263,900)	(3,445,900)
Borrowings under revolving long-term debt	3,430,650	1,592,400	3,696,200
Change in bank drafts outstanding	(7,174)	(35,608)	24,637
Proceeds from issuance of long-term debt		998,780
Debt issuance costs		(8,339)
Credit Facility costs	(6,150)		(10,211)
Proceeds from exercise of common stock options	9,801	9,184	6,412
Tax benefit for stock-based compensation			14,626
Other	(978)	(428)	(261)
Net cash provided by financing activities	277,199	290,889	284,303
Effect of exchange rate changes on cash	(596)	(198)	242
Increase (decrease) in cash and cash equivalents	(30,645)	37,956	(428)
Cash and cash equivalents at beginning of year	53,583	15,627	16,055
Cash and cash equivalents at end of year	$ 22,938	$ 53,583	$ 15,627