Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 20,963	$ 14,904
Revenue receivable	15,150	17,742
Joint interest billing receivable	36,264	42,595
Other Receivables, Net, Current	0	9,208
Derivative asset	0	830
Prepaid drilling costs	874	1,698
Drilling pipe inventory	753	707
Other current assets	4,549	1,900
Total current assets	78,553	89,584
Oil and gas properties:
Oil and gas properties, full cost method	1,768,031	1,734,477
Unevaluated oil and gas properties	70,203	71,713
Accumulated depreciation, depletion and amortization	(1,495,299)	(1,472,244)
Oil and gas properties, net	342,935	333,946
Gas gathering assets	12,419	12,370
Accumulated depreciation and amortization of gas gathering assets	(7,867)	(7,607)
Total property and equipment	347,487	338,709
Other assets, net of accumulated depreciation and amortization of $4,441 and $4,240, respectively	4,761	5,110
Total assets	430,801	433,403
Current liabilities:
Accounts payable to vendors	38,947	58,960
Advances from co-owners	31,201	20,459
Oil and gas revenue payable	23,195	26,175
Accrued interest and preferred stock dividend	2,456	6,190
Asset retirement obligation	3,845	2,351
Derivative Liabilities, Current	3,807	233
Other accrued liabilities	5,678	6,535
Total current liabilities	109,129	120,903
Bank debt	60,000	50,000
10% Senior Notes	150,000	150,000
Asset retirement obligation	24,661	24,909
Derivative Liabilities, Noncurrent	251	0
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 62,907 and 62,768 shares, respectively	63	63
Paid-in capital	277,006	276,534
Accumulated other comprehensive income	(3,389)	521
Accumulated deficit	(186,921)	(189,528)
Total stockholders' equity	86,760	87,591
Total liabilities and stockholders' equity	$ 430,801	$ 433,403