Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Operating activities:
Net (loss) income		$ (6,243)		$ (107,538)		$ 29,076
Adjustment for net (income) loss from discontinued operations		(16,202)		80,873		138
Net (loss) income from continuing operations		(22,445)		(26,665)		29,214
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation		629		1,688		1,434
Foreign currency loss		3,091		5,910		6,448
Loss (gain) on commodity derivative contracts		3,257		(27,457)		(37,454)
Cash settlement on commodity derivative contracts		4,188		57,076		(2,100)
Amortization on loan financing costs		1,201		1,677		1,025
Bad debt expense				422		1,487
Deferred income tax (benefit) expense		(25)		18,642		11,875
Exploration, abandonment and impairment		5,963		21,544		19,864
Depreciation, depletion and amortization		29,025		37,707		48,594
Accretion of asset retirement obligations		373		368		406
Gain on sale of gas gathering facility		(620)
Derivative put costs				(4,638)
Revaluation of contingent consideration						(2,500)
Changes in operating assets and liabilities:
Accounts receivable		(8,180)		18,274		(3,326)
Prepaid expenses and other assets		(4,040)		1,341		(1,777)
Accounts payable and accrued liabilities		8,936		(19,380)		4,734
Net cash provided by operating activities from continuing operations		21,353		86,509		77,924
Net cash provided by (used in) operating activities from discontinued operations		220		(14,483)		(264)
Net cash provided by operating activities		21,573		72,026		77,660
Investing activities:
Acquisitions, net of cash						66
Additions to oil and natural gas properties		(9,512)		(22,843)		(107,353)
Additions to equipment and other properties		(1,204)		(3,572)		(6,318)
Proceeds from asset sale		1,104
Restricted cash		1,094		(5,261)		(1,917)
Net cash used in investing activities from continuing operations		(8,518)		(31,676)		(115,522)
Net cash used in investing activities from discontinued operations				(12,329)		(1,174)
Net cash used in investing activities		(8,518)		(44,005)		(116,696)
Financing activities:
Issuance of common shares		1,658
Issuance of Series A Preferred Shares		5,300
Tax withholding on restricted share units		(66)		(391)		(76)
Treasury stock purchases				(970)
Loan proceeds		33,778		12,378		73,237
Loan proceeds - related party				3,593		20,800
Loan repayment		(47,123)		(54,834)		(28,096)
Loan repayment - related party		(898)
Loan financing costs				(30)		(2,630)
Net cash (used in) provided by financing activities from continuing operations		(7,351)		(40,254)		63,235
Net cash used in financing activities from discontinued operations				(13,709)		(1,674)
Net cash (used in) provided by financing activities		(7,351)		(53,963)		61,561
Effect of exchange rate on cash flows and cash equivalents		(1,599)		(1,318)		(666)
Net increase (decrease) in cash and cash equivalents		4,105		(27,260)		21,859
Cash and cash equivalents, beginning of year		7,480	[1]	34,740	[1]	12,881
Cash and cash equivalents, end of year	[1]	11,585		7,480		34,740
Supplemental disclosures:
Cash paid for interest		6,576		9,522		3,490
Cash paid for taxes		4,842		3,044
Supplemental non-cash financing activities:
Repayment of the Prepayment Agreement				3,043
Contingent payment event				$ (4,188)		4,188
Common Shares [Member]
Supplemental non-cash financing activities:
Issuance of shares		2,312				$ 23,850
Series A Preferred Shares [Member]
Supplemental non-cash financing activities:
Issuance of shares		$ 40,750

[1] Includes TBNG cash held for sale of $1.6 million and $1.8 million at December 31, 2016 and 2015, respectively.