Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 10,034	$ 5,700
Restricted cash	2,555	3,758
Accounts receivable, net
Oil and natural gas sales	17,885	10,300
Joint interest and other	3,230	2,548
Related party	762	408
Prepaid and other current assets	4,756	2,063
Derivative asset		3,235
Inventory	3,647
Assets held for sale	25,217	61,247
Total current assets	68,086	89,259
Oil and natural gas properties (successful efforts method)
Proved	197,214	233,143
Unproved	21,109	25,630
Equipment and other property	20,273	32,173
Property and equipment, gross	238,596	290,946
Less accumulated depreciation, depletion and amortization	(120,638)	(122,533)
Property and equipment, net	117,958	168,413
Other long-term assets:
Other assets	2,725	1,455
Note receivable - related party	7,624	11,500
Derivative asset		3,370
Assets held for sale		24,192
Total other assets	10,349	40,517
Total assets	196,393	298,189
Current liabilities:
Accounts payable	7,036	6,159
Accounts payable - related party	1,844	2,553
Accrued liabilities	12,492	8,366
Derivative liability	596
Loans payable	35,000	31,874
Loan payable - related party	3,194	3,593
Liabilities held for sale - related party		3,671
Liabilities held for sale	15,938	79,514
Total current liabilities	76,100	135,730
Long-term liabilities:
Asset retirement obligations	4,833	5,521
Accrued liabilities	8,126	10,908
Deferred income taxes	18,806	22,603
Loans payable	3,750	34,400
Derivative liability	242
Loan payable - related party		20,600
Liabilities held for sale		9,505
Total long-term liabilities	35,757	103,537
Total liabilities	111,857	239,267
Commitments and contingencies
Shareholders' equity:
Common shares, $0.10 par value, 100,000,000 shares authorized; 47,220,525 shares and 41,017,777 shares issued and outstanding as of December 31, 2016 and December 31, 2015, respectively	4,722	4,102
Treasury stock	(970)	(970)
Additional paid-in-capital	573,278	569,365
Accumulated other comprehensive loss	(140,316)	(121,590)
Accumulated deficit	(398,228)	(391,985)
Total shareholders' equity	38,486	58,922
Total liabilities, Series A preferred shares and shareholders' equity	196,393	$ 298,189
Series A Preferred Shares [Member]
Long-term liabilities:
Preferred shares, value	25,500
Related Party [Member] | Series A Preferred Shares [Member]
Long-term liabilities:
Preferred shares, value	$ 20,550