CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 206,167		$ 15,627
Accounts receivable	299,316		341,915
Inventories	37,323		46,234
Hedging asset	620,711		514,465
Other	64,890		60,037
Total current assets	1,228,407		978,278
Property and Equipment:
Natural gas and oil properties, using the full cost method, including $1,128.5 million in 2012 and $942.9 million in 2011 excluded from amortization	10,080,579		9,544,708
Gathering systems	1,006,487		980,647
Other	556,888		535,464
Total property and equipment	11,643,954		11,060,819
Less: Accumulated depreciation, depletion and amortization	4,617,882		4,415,339
Property and equipment, net	7,026,072		6,645,480
Other Assets	299,682		279,139
TOTAL ASSETS	8,554,161	[1]	7,902,897
Current Liabilities:
Current portion of long-term debt	1,200		1,200
Accounts payable	512,017		514,071
Taxes payable	48,976		40,691
Interest payable	13,847		20,565
Advances from partners	118,317		84,082
Hedging liability	14,578		12,458
Current deferred income taxes	234,249		194,163
Other	17,460		17,683
Total current liabilities	960,644		884,913
Long-Term Debt	1,669,380		1,342,100
Other Liabilities:
Deferred income taxes	1,660,284		1,586,798
Long-term hedging liability	136		55
Pension and other postretirement liabilities	20,284		20,338
Other long-term liabilities	91,674		99,389
Total Other Liabilities	1,772,378		1,706,580
Equity:
Common stock, $0.01 par value; authorized 1,250,000,000 shares; issued 349,227,496 shares in 2012 and 349,058,501 in 2011	3,492		3,491
Additional paid-in capital	911,646		903,399
Retained earnings	2,763,918		2,656,214
Accumulated other comprehensive income	474,998		408,428
Common stock in treasury, 100,970 shares in 2012 and 98,889 in 2011	(2,295)		(2,228)
Total Equity	4,151,759		3,969,304
TOTAL LIABILITIES AND EQUITY	$ 8,554,161		$ 7,902,897

[1] (2) Other assets represent corporate assets not allocated to segments and assets, including investments in cash equivalents, for non-reportable segments.