Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 10,469	$ 17,014
Restricted cash	2,596	2,291
Oil and gas revenue receivable	86,763	133,042
Joint interest billing and other receivables, net	6,701	11,348
Derivative assets	10,985	23,374
Income tax receivable		6,431
Inventory	18,277	18,757
Other current assets	2,840	2,473
Total current assets	138,631	214,730
Oil and gas properties, net, using the full cost method of accounting:
Proven	1,543,166	1,497,727
Property, plant and equipment, net	11,178	11,635
Long-term right-of-use assets	127,861
Other assets	13,532	9,196
Total assets	1,834,368	1,733,288
Current liabilities:
Accounts payable	36,314	36,923
Accrued liabilities	62,999	58,574
Production taxes payable	84,108	58,365
Current portion of long-term debt	9,750	7,313
Interest payable	28,771	28,672
Lease liabilities	11,261
Derivative liabilities	38,483	62,350
Capital cost accrual	16,966	15,014
Total current liabilities	288,652	267,211
Long-term debt
Credit facility	38,000	104,000
Long-term debt	1,915,906	1,932,722
Add: Premium on exchange transactions	235,941	228,096
Less: Unamortized deferred financing costs and discount	(54,161)	(56,650)
Total long-term debt, net	2,135,686	2,208,168
Deferred gain on sale of liquids gathering system		94,636
Long-term lease liabilities	116,613
Other long-term obligations	207,420	211,895
Total liabilities	2,748,371	2,781,910
Commitments and contingencies (Note 9)
Shareholders' equity:
Common stock - no par value; authorized - 750,000,000; issued and outstanding - 197,383,295 at March 31, 2019 and December 31, 2018, respectively	2,138,570	2,137,443
Treasury stock	(49)	(49)
Retained loss	(3,052,524)	(3,186,016)
Total shareholders' deficit	(914,003)	(1,048,622)
Total liabilities and shareholders' equity	$ 1,834,368	$ 1,733,288