Condensed Consolidated Balance Sheet (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 65,454	$ 106,956
Restricted cash	0	5,500
Accounts receivable	113,547	88,529
Fair value of hedging contracts	56,767	12,955
Current income tax receivable	22,149	0
Deferred taxes	4,713	27,274
Inventory	4,802	6,465
Other current assets	933	768
Total current assets	268,365	248,447
Oil and gas properties, full cost method of accounting:
Proved	6,101,241	5,789,578
Less: accumulated depreciation, depletion and amortization	(5,009,076)	(4,804,949)
Net proved oil and gas properties	1,092,165	984,629
Unevaluated	511,574	413,180
Other property and equipment, net	11,191	10,722
Fair value of hedging contracts	50,171	0
Other assets, net	23,795	22,112
Total assets	1,957,261	1,679,090
Current liabilities:
Accounts payable to vendors	90,659	103,208
Undistributed oil and gas proceeds	16,924	10,037
Accrued interest	9,358	14,062
Fair value of hedging contracts	951	32,144
Asset retirement obligations	55,068	42,300
Current income tax payable	0	239
Other current liabilities	17,496	16,075
Total current liabilities	190,456	218,065
Long-term debt	575,000	575,000
Deferred taxes	219,393	99,227
Asset retirement obligations	289,604	331,620
Fair value of hedging contracts	0	3,606
Other long-term liabilities	19,034	21,215
Total liabilities	1,293,487	1,248,733
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value; authorized 100,000,000 shares; issued 48,076,951 and 47,764,505 shares, respectively	481	478
Treasury stock (16,582 shares, respectively, at cost)	(860)	(860)
Additional paid-in capital	1,336,460	1,331,500
Accumulated deficit	(737,748)	(886,557)
Accumulated other comprehensive income (loss)	65,441	(14,204)
Total stockholders' equity	663,774	430,357
Total liabilities and stockholders' equity	$ 1,957,261	$ 1,679,090