CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 18,560	$ 15,627
Restricted cash	127,074
Accounts receivable	297,773	341,915
Inventories	30,630	46,234
Hedging asset	300,861	514,465
Other	71,849	60,037
Total current assets	846,747	978,278
Property and Equipment:
Natural gas and oil properties, using the full cost method, including $1,130.4 million in 2012 and $942.9 million in 2011 excluded from amortization	10,855,274	9,544,708
Gathering systems	1,087,139	980,647
Other	564,490	535,464
Less: Accumulated depreciation, depletion and amortization	(6,131,344)	(4,415,339)
Total property and equipment, net	6,375,559	6,645,480
Other Assets	134,256	279,139
TOTAL ASSETS	7,356,562	7,902,897
Current liabilities:
Accounts payable	468,646	514,071
Taxes payable	36,902	40,691
Interest payable	14,232	20,565
Advances from partners	110,237	84,082
Current deferred income taxes	116,463	194,163
Other	14,685	31,341
Total current liabilities	761,165	884,913
Long-term debt	1,695,342	1,342,100
Other Liabilities:
Deferred income taxes	1,313,584	1,586,798
Pension and other postretirement liabilities	18,141	20,338
Other long-term liabilities	141,321	99,444
Total long-term liabilities	3,168,388	3,048,680
Equity:
Common stock, $0.01 par value; authorized 1,250,000,000 shares; issued 350,415,917 shares in 2012 and 349,058,501 in 2011	3,504	3,491
Additional paid-in capital	928,322	903,399
Retained earnings	2,304,733	2,656,214
Accumulated other comprehensive income	192,040	408,428
Common stock in treasury, 66,791 shares in 2012 and 98,889 in 2011	(1,590)	(2,228)
Total equity	3,427,009	3,969,304
TOTAL LIABILITIES AND EQUITY	$ 7,356,562	$ 7,902,897