Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 30,901	$ 9,153
Revenue receivable	26,113	26,568
Joint interest billing receivable	17,967	26,556
Derivative asset	22	521
Prepaid drilling costs	343	477
Other current assets	7,532	8,132
Total current assets	82,878	71,407
Oil and gas properties:
Oil and gas properties, full cost method	2,111,889	2,035,899
Unevaluated oil and gas properties	126,571	98,387
Accumulated depreciation, depletion and amortization	(1,594,875)	(1,553,044)
Oil and gas properties, net	643,585	581,242
Other property and equipment	14,511	13,993
Accumulated depreciation of other property and equipment	9,571	8,901
Total property and equipment	648,525	586,334
Derivative asset	164	0
Other assets, net of accumulated depreciation and amortization of $6,753 and $5,689, respectively	8,017	9,449
Total assets	739,584	667,190
Current liabilities:
Accounts payable to vendors	42,730	47,341
Advances from co-owners	16,407	969
Oil and gas revenue payable	35,676	22,664
Accrued interest and preferred stock dividend	12,780	12,909
Asset retirement obligation	2,959	3,113
Derivative liability	3,840	1,617
Accrued acquisition cost	14,000	0
Other accrued liabilities	11,738	8,924
Total current liabilities	140,130	97,537
Bank debt	72,500	75,000
10% Senior Notes	350,000	350,000
Asset retirement obligation	46,893	45,423
Accrued acquisition cost	10,000	0
Other long-term liability	220	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 64,179 and 63,664 shares, respectively	64	64
Paid-in capital	284,380	280,711
Accumulated other comprehensive loss	(3,654)	(1,096)
Accumulated deficit	(160,950)	(180,585)
Total stockholders’ equity	119,841	99,095
Total liabilities and stockholders’ equity	$ 739,584	$ 667,190