Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 18,243	$ 9,153
Revenue receivable	16,485	26,568
Joint interest billing receivable	46,778	26,556
Derivative asset	8,631	521
Prepaid drilling costs	847	477
Other current assets	5,566	8,132
Total current assets	96,550	71,407
Oil and gas properties:
Oil and gas properties, full cost method	2,222,753	2,035,899
Unevaluated oil and gas properties	109,119	98,387
Accumulated depreciation, depletion and amortization	(1,648,060)	(1,553,044)
Oil and gas properties, net	683,812	581,242
Other property and equipment	14,953	13,993
Accumulated depreciation of other property and equipment	(10,313)	(8,901)
Total property and equipment	688,452	586,334
Other assets, net of accumulated amortization of $7,847 and $5,689, respectively	5,893	9,449
Total assets	790,895	667,190
Current liabilities:
Accounts payable to vendors	102,954	47,341
Advances from co-owners	12,819	969
Oil and gas revenue payable	22,333	22,664
Accrued interest and preferred stock dividend	12,764	12,909
Asset retirement obligation	2,756	3,113
Derivative liability	0	1,617
Accrued acquisition costs	17,690	0
Other accrued liabilities	5,394	8,924
Total current liabilities	176,710	97,537
Bank debt	75,000	75,000
10% Senior Notes	350,000	350,000
Asset retirement obligation	52,214	45,423
Other long-term liability	62	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 64,721 and 63,664 shares, respectively	65	64
Paid-in capital	285,957	280,711
Accumulated other comprehensive income (loss)	5,420	(1,096)
Accumulated deficit	(154,534)	(180,585)
Total stockholders’ equity	136,909	99,095
Total liabilities and stockholders’ equity	$ 790,895	$ 667,190