Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 19,439	$ 6,313
Equity securities		47,082
Accounts receivable:
Oil, natural gas and natural gas liquids revenues	37,233	40,176
Other	853	4,496
Derivative asset	2,451	15,452
Other current assets	769	2,314
Total current assets	60,745	115,833
Oil and natural gas properties, net of accumulated depreciation, depletion and amortization; March 31, 2019, $16,787; December 31, 2018, $12,950	323,743	405,688
Assets held for sale	48,998
Long-term derivative asset	3,220	8,499
Other assets	5,558	4,474
Total assets	442,264	534,494
Current liabilities:
Accounts payable and accrued liabilities	26,043	26,146
Derivative liability	376	1,165
Other current liabilities	763
Total current liabilities	27,182	27,311
Asset retirement obligations	110,712	117,529
Long-term debt, net	55,000	115,000
Liabilities held for sale	9,455
Other long-term liabilities	1,973	1,036
Commitments and contingencies (Note 11)
Mezzanine equity	117	79
Stockholders’ equity:
Common stock – $0.01 par value; 65,000,000 shares authorized; 10,054,816 shares issued and 10,042,468 shares outstanding as of March 31, 2019 and December 31, 2018	100	100
Additional paid-in capital	249,778	249,717
Treasury stock at cost – 12,348 shares at March 31, 2019 and December 31, 2018	(247)	(247)
Retained earnings (accumulated deficit)	(11,806)	23,969
Total stockholders’ equity	237,825	273,539
Total liabilities and equity	$ 442,264	$ 534,494