CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 53,583	$ 15,627
Restricted cash	8,542
Accounts receivable	377,638	341,915
Inventories	28,141	46,234
Hedging asset	282,693	514,465
Other	58,315	60,037
Total current assets	808,912	978,278
Property and Equipment:
Natural gas and oil properties, using the full cost method, including $1,023.9 million in 2012 and $942.9 million in 2011 excluded from amortization	11,283,114	9,544,708
Gathering systems	1,148,261	980,647
Other	597,064	535,464
Less: Accumulated depreciation, depletion and amortization	(7,191,463)	(4,415,339)
Total property and equipment, net	5,836,976	6,645,480
Other Assets	91,639	279,139
TOTAL ASSETS	6,737,527	7,902,897
Current liabilities:
Accounts payable	459,569	514,071
Taxes payable	62,980	40,691
Interest payable	34,431	20,565
Advances from partners	68,919	84,082
Current deferred income taxes	106,123	194,163
Other	35,749	31,341
Total current liabilities	767,771	884,913
Total long-term debt	1,668,273	1,342,100
Long-term debt	1,668,273	1,342,100
Other Liabilities:
Deferred income taxes	1,049,138	1,586,798
Pension and other postretirement liabilities	33,174	20,338
Other long-term liabilities	183,299	99,444
Total long-term liabilities	2,933,884	3,048,680
Equity:
Common stock, $0.01 par value; authorized 1,250,000,000 shares; issued 351,100,391 shares in 2012 and 349,058,501 in 2011	3,511	3,491
Additional paid-in capital	934,939	903,399
Retained earnings	1,949,150	2,656,214
Accumulated other comprehensive income	149,804	408,428
Common stock in treasury, 64,715 shares in 2012 and 98,889 in 2011	(1,532)	(2,228)
Total equity	3,035,872	3,969,304
TOTAL LIABILITIES AND EQUITY	$ 6,737,527	$ 7,902,897