Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 18,064	$ 28,312
Revenue receivable	10,096	10,294
Joint interest billing receivable	5,369	7,632
Derivative asset	765	0
Other current assets	3,469	2,353
Total current assets	37,763	48,591
Oil and gas properties:
Oil and gas properties, full cost method	1,365,792	1,323,333
Unevaluated oil and gas properties	14,921	9,015
Accumulated depreciation, depletion and amortization	(1,266,954)	(1,243,286)
Oil and gas properties, net	113,759	89,062
Other property and equipment	9,351	10,951
Accumulated depreciation of other property and equipment	(8,749)	(10,109)
Total property and equipment	114,361	89,904
Other assets	7,402	6,365
Total assets	159,526	144,860
Current liabilities:
Accounts payable to vendors	38,240	25,265
Advances from co-owners	2,754	2,330
Oil and gas revenue payable	18,440	22,146
Accrued interest	1,631	2,047
Asset retirement obligation	1,630	4,160
Derivative liability	283	3,947
10% Senior Unsecured Notes due 2017	0	22,568
Other accrued liabilities	538	3,938
Total current liabilities	63,516	86,401
Multi-draw Term Loan	27,788	7,249
Asset retirement obligation	34,330	32,450
Other long-term liabilities	9,533	6,027
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 21,235 and 21,197 shares, respectively	21	21
Paid-in capital	305,566	304,341
Accumulated other comprehensive income (loss)	303	(4,750)
Accumulated deficit	(562,095)	(550,708)
Total stockholders’ equity	(256,204)	(251,095)
Total liabilities and stockholders’ equity	159,526	144,860
10% Senior Secured Notes due 2021 | Senior Notes
Current liabilities:
10% Senior Secured Notes	14,932	15,228
10% Senior Secured PIK Notes due 2021 | Payment in Kind (PIK) Note
Current liabilities:
10% Senior Secured Notes	$ 265,631	$ 248,600