Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 13,141	$ 16,631
Restricted cash	1,990	1,638
Oil and gas revenue receivable	65,091	86,487
Joint interest billing and other receivables, net	25,521	16,616
Derivative assets	12,728	16,865
Income tax receivable	6,431	10,091
Inventory	20,202	13,450
Other current assets	2,082	5,647
Total current assets	147,186	167,425
Oil and gas properties, net, using the full cost method of accounting:
Proven	1,459,666	1,325,068
Property, plant and equipment, net	10,876	9,569
Other assets	8,097	10,920
Total assets	1,625,825	1,512,982
Current liabilities:
Accounts payable	29,898	59,951
Accrued liabilities	77,016	80,268
Production taxes payable	72,458	51,352
Current portion of long-term debt	4,875
Interest payable	41,821	24,406
Derivative liabilities	61,926
Capital cost accrual	16,468	32,513
Total current liabilities	304,462	248,490
Long-term debt	2,118,329	2,116,211
Deferred gain on sale of liquids gathering system	97,274	105,189
Other long-term obligations	199,874	197,728
Total liabilities	2,719,939	2,667,618
Commitments and contingencies (Note 9)
Shareholders' equity:
Common stock - no par value; authorized - unlimited; issued and outstanding - 197,053,583 and 196,346,736 at September 30, 2018 and December 31, 2017, respectively	2,131,340	2,116,018
Treasury stock	(49)	(49)
Retained loss	(3,225,405)	(3,270,605)
Total shareholders' deficit	(1,094,114)	(1,154,636)
Total liabilities and shareholders' equity	$ 1,625,825	$ 1,512,982