Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 867	$ 1,618
Accounts receivable:
Joint owners, net	17,110	14,218
Oil and gas production sales	21,991	17,789
Other	535	86
Total accounts receivable	39,636	32,093
Derivative asset - short-term	9,602
Other current assets	626	778
Total current assets	50,731	34,489
Proved oil and gas properties	1,091,905	923,237
Other property and equipment	39,453	39,136
Total	1,131,358	962,373
Less accumulated depreciation, depletion, amortization and impairment	(768,140)	(724,606)
Total property and equipment - net	363,218	237,767
Derivative asset, long-term	10,527
Deferred financing fees - net	1,149	1,285
Other assets	265	265
Total assets	425,890	273,806
Current liabilities:
Accounts payable	39,571	45,570
Joint interest oil and gas production payable	23,063	11,502
Accrued interest	335	140
Other accrued liabilities	511	539
Derivative liability, current	616	10,837
Current maturities of long-term debt	267	262
Total current liabilities	64,363	68,850
Long-term debt - less current maturities	183,091	87,354
Other liabilities		132
Derivative liability, long-term	4,434	2,387
Future site restoration	7,492	8,775
Total liabilities	259,380	167,498
Commitments and contingencies (Note 9)
Stockholders' Equity
Preferred stock, par value $0.01 per share - authorized 1,000,000 shares; - 0- shares issued and outstanding
Common stock, par value $0.01 per share, authorized 400,000,000 shares; 165,889,901 and 166,713,784 issued and outstanding at December 31, 2017 and 2018, respectively	1,667	1,659
Additional paid-in capital	417,844	415,471
Accumulated deficit	(253,001)	(310,822)
Total stockholders' equity	166,510	106,308
Total liabilities and stockholders' equity	$ 425,890	$ 273,806