Condensed Consolidated Balance Sheet (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 82,021	$ 106,956
Restricted cash	0	5,500
Accounts receivable	132,127	88,529
Fair value of hedging contracts	11,531	12,955
Current income tax receivable	6,403	0
Deferred taxes	26,027	27,274
Inventory	5,302	6,465
Other current assets	1,248	768
Total current assets	264,659	248,447
Oil and gas properties, full cost method of accounting:
Proved	5,943,929	5,789,578
Less: accumulated depreciation, depletion and amortization	(4,945,158)	(4,804,949)
Net proved oil and gas properties	998,771	984,629
Unevaluated	510,717	413,180
Other property and equipment, net	10,754	10,722
Fair value of hedging contracts	4,748	0
Other assets, net	24,694	22,112
Total assets	1,814,343	1,679,090
Current liabilities:
Accounts payable to vendors	93,054	103,208
Undistributed oil and gas proceeds	14,706	10,037
Accrued interest	14,058	14,062
Fair value of hedging contracts	25,384	32,144
Asset retirement obligations	48,590	42,300
Current income tax payable	0	239
Other current liabilities	15,850	16,075
Total current liabilities	211,642	218,065
Long-term debt	575,000	575,000
Deferred taxes	157,690	99,227
Asset retirement obligations	306,357	331,620
Fair value of hedging contracts	7,887	3,606
Other long-term liabilities	21,482	21,215
Total liabilities	1,280,058	1,248,733
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value; authorized 100,000,000 shares; issued 48,017,749 and 47,764,505 shares, respectively	480	478
Treasury stock (16,582 shares, respectively, at cost)	(860)	(860)
Additional paid-in capital	1,334,800	1,331,500
Accumulated deficit	(789,569)	(886,557)
Accumulated other comprehensive (loss)	(10,566)	(14,204)
Total stockholders' equity	534,285	430,357
Total liabilities and stockholders' equity	$ 1,814,343	$ 1,679,090