CONDENSED CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 176,186		$ 38,451		$ 65,454	$ 106,956
Accounts receivable	127,250		118,139
Fair value of hedging contracts	34,010		25,177
Current income tax receivable	24,066		19,946
Deferred taxes	12,280	[1]	26,072	[1]
Inventory	4,506		4,643
Other current assets	3,246		791
Total current assets	381,544		233,219
Oil and gas properties, full cost method of accounting:
Proved	7,039,450		6,648,168
Less: accumulated depreciation, depletion and amortization	(5,427,668)		(5,174,729)
Net proved oil and gas properties	1,611,782		1,473,439
Unevaluated	454,639		401,609
Other property and equipment, net	13,399		11,172
Fair value of hedging contracts	18,155		22,543
Other assets, net	35,158		23,769
Total assets	2,514,677		2,165,751
Current liabilities:
Accounts payable to vendors	99,362		102,946
Undistributed oil and gas proceeds	24,277		27,328
Accrued interest	9,774		14,059
Fair value of hedging contracts	1,077		11,122
Asset retirement obligations	59,366		62,676
Other current liabilities	11,405		28,370
Total current liabilities	205,261		246,501
Long-term debt	811,024		620,000
Deferred taxes	298,100		247,835
Asset retirement obligations	351,023		363,103
Fair value of hedging contracts	2,266		815
Other long-term liabilities	20,844		19,668
Total liabilities	1,688,518		1,497,922
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value; authorized 100,000,000 shares; issued 48,390,463 and 48,076,860 shares, respectively	484		481
Treasury stock (16,582 shares, at cost)	(860)		(860)
Additional paid-in capital	1,383,741		1,338,565
Accumulated deficit	(587,045)		(692,225)
Accumulated other comprehensive income	29,839		21,868
Total stockholders' equity	826,159		667,829
Total liabilities and stockholders' equity	$ 2,514,677		$ 2,165,751

[1] Deferred income taxes have been allocated to the guarantor subsidiary where related oil and gas properties reside.