CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 15,627	$ 16,055
Accounts receivable	341,915	351,573
Inventories	46,234	35,098
Hedging asset	514,465	130,412
Other	60,037	47,755
Total current assets	978,278	580,893
Property and Equipment:
Natural gas and oil properties, using the full cost method, including $942.9 million in 2011 and $712.1 million in 2010 excluded from amortization	9,544,708	7,749,863
Gathering systems	980,647	817,465
Other	535,464	413,557
Total property and equipment	11,060,819	8,980,885
Less: Accumulated depreciation, depletion and amortization	4,415,339	3,682,688
Property and equipment, net	6,645,480	5,298,197
Other Assets	279,139	138,373
TOTAL ASSETS	7,902,897	6,017,463
Current Liabilities:
Current portion of long-term debt	1,200	1,200
Accounts payable	514,071	473,890
Taxes payable	40,691	50,051
Interest payable	20,565	19,954
Advances from partners	84,082	81,705
Hedging liability	12,458	7,685
Current deferred income taxes	194,163	44,089
Other	17,683	15,409
Total current liabilities	884,913	693,983
Long-Term Debt	1,342,100	1,093,000
Other Liabilities:
Deferred income taxes	1,586,798	1,130,292
Long-term hedging liability	55	40,188
Pension and other postretirement liabilities	20,338	15,777
Other long-term liabilities	99,389	79,347
Total Other Liabilities	1,706,580	1,265,604
Commitments and Contingencies
Equity:
Common stock, $0.01 par value; authorized 1,250,000,000 shares in 2011 and 1,250,000,000 in 2010; issued 349,058,501 shares in 2011 and 347,733,839 in 2010	3,491	3,477
Additional paid-in capital	903,399	862,423
Retained earnings	2,656,214	2,018,445
Accumulated other comprehensive income	408,428	83,975
Common stock in treasury, 98,889 shares in 2011 and 156,636 in 2010	(2,228)	(3,444)
Total Equity	3,969,304	2,964,876
TOTAL LIABILITIES AND EQUITY	$ 7,902,897	$ 6,017,463