Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 19,772	$ 28,312
Revenue receivable	9,605	10,294
Joint interest billing receivable	5,268	7,632
Derivative asset	966	0
Other current assets	3,612	2,353
Total current assets	39,223	48,591
Oil and gas properties:
Oil and gas properties, full cost method	1,344,653	1,323,333
Unevaluated oil and gas properties	14,867	9,015
Accumulated depreciation, depletion and amortization	(1,258,254)	(1,243,286)
Oil and gas properties, net	101,266	89,062
Other property and equipment	9,336	10,951
Accumulated depreciation of other property and equipment	(8,654)	(10,109)
Total property and equipment	101,948	89,904
Other assets	7,402	6,365
Total assets	148,573	144,860
Current liabilities:
Accounts payable to vendors	28,725	25,265
Advances from co-owners	4,545	2,330
Oil and gas revenue payable	18,692	22,146
Accrued interest	1,851	2,047
Asset retirement obligation	2,759	4,160
Derivative liability	457	3,947
10% Senior Unsecured Notes due 2017	0	22,568
Other accrued liabilities	1,051	3,938
Total current liabilities	58,080	86,401
Multi-draw Term Loan	27,605	7,249
Asset retirement obligation	33,759	32,450
Other long-term liabilities	7,742	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 21,219 and 21,197 shares, respectively	21	21
Paid-in capital	305,232	304,341
Accumulated other comprehensive income (loss)	320	(4,750)
Accumulated deficit	(559,011)	(550,708)
Total stockholders’ equity	(253,437)	(251,095)
Total liabilities and stockholders’ equity	148,573	144,860
10% Senior Secured Notes due 2021 | Senior Notes
Current liabilities:
10% Senior Secured Notes	15,008	15,228
10% Senior Secured PIK Notes due 2021 | Payment in Kind (PIK) Note
Current liabilities:
10% Senior Secured Notes	$ 259,816	$ 248,600