CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash Flows From Operating Activities
Net income (loss)	$ (297,428)	$ 304,063
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	403,250	337,035
Impairment of natural gas and oil properties	800,652
Deferred income taxes	(182,596)	197,767
Unrealized gain on derivatives	(4,567)	(3,975)
Stock-based compensation	5,549	4,686
Other	487	170
Change in assets and liabilities:
Accounts receivable	69,166	14,856
Inventories	8,088	6,761
Accounts payable	(1,349)	(7,380)
Taxes payable	20,762	(12,340)
Interest payable	4,762	(164)
Advances from partners	31,995	7,949
Other assets and liabilities	(21,381)	7,502
Net cash provided by operating activities	837,390	856,930
Cash Flows From Investing Activities
Capital investments	(1,140,661)	(1,024,658)
Proceeds from sale of property and equipment	174,337	121,133
Transfers to restricted cash	(167,750)	(85,002)
Transfers From Restricted Cash	23,366
Other	8,895	3,879
Net cash used in investing activities	(1,101,813)	(984,648)
Cash Flows From Financing Activities
Payment on current portion of long-term debt	(600)	(600)
Payments on revolving long-term debt	(1,273,700)	(1,717,600)
Borrowings under revolving long-term debt	602,200	1,840,600
Change in bank drafts outstanding	(30,730)	9,260
Proceeds from issuance of long-term debt	998,780
Debt Issuance Costs	(8,338)
Revolving credit facility costs		(10,210)
Proceeds from exercise of common stock options	2,698	3,365
Net cash provided by (used in) financing activities	290,310	124,815
Effect of exchange rate changes on cash	(15)	127
Increase (decrease) in cash and cash equivalents	25,872	(2,776)
Cash and cash equivalents at beginning of year	15,627	16,055
Cash and cash equivalents at end of period	$ 41,499	$ 13,279