Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 11,991	$ 9,153
Revenue receivable	24,104	26,568
Joint interest billing receivable	23,872	26,556
Derivative asset	27	521
Prepaid drilling costs	520	477
Other current assets	8,176	8,132
Total current assets	68,690	71,407
Oil and gas properties:
Oil and gas properties, full cost method	2,068,266	2,035,899
Unevaluated oil and gas properties	102,707	98,387
Accumulated depreciation, depletion and amortization	(1,573,147)	(1,553,044)
Oil and gas properties, net	597,826	581,242
Other property and equipment	14,251	13,993
Accumulated depreciation of other property and equipment	(9,226)	(8,901)
Total property and equipment	602,851	586,334
Other assets, net of accumulated depreciation and amortization of $6,216 and $5,689, respectively	8,783	9,449
Total assets	680,324	667,190
Current liabilities:
Accounts payable to vendors	42,713	47,341
Advances from co-owners	7,002	969
Oil and gas revenue payable	29,710	22,664
Accrued interest and preferred stock dividend	4,224	12,909
Asset retirement obligation	3,390	3,113
Derivative liability	4,541	1,617
Other accrued liabilities	9,810	8,924
Total current liabilities	101,390	97,537
Bank debt	75,000	75,000
10% Senior Notes	350,000	350,000
Asset retirement obligation	45,780	45,423
Other long-term liability	180	135
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $.001 par value; authorized 5,000 shares; issued and outstanding 1,495 shares	1	1
Common stock, $.001 par value; authorized 150,000 shares; issued and outstanding 64,035 and 63,664 shares, respectively	64	64
Paid-in capital	282,965	280,711
Accumulated other comprehensive loss	(4,514)	(1,096)
Accumulated deficit	(170,542)	(180,585)
Total stockholders’ equity	107,974	99,095
Total liabilities and stockholders’ equity	$ 680,324	$ 667,190