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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 24	$ 32	$ 74	$ 61
Change in value of investments accounted at fair value	667	119	443	618
Change in value of warrant liabilities	(1,445)	3,038	(1,081)	845
Change in value of convertible debentures	465	147	320	(775)
Sale of surplus assets	265	345	279	1,138
Foreign exchange gain (loss)	134	1	111	36
Gain on sale of assets held for sale	341	0	341	0
Other	48	(2)	75	(160)
Other income	$ 499	$ 3,680	$ 562	$ 1,763

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Change in value of convertible debentures

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Change in value of investments accounted at fair value

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Other

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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-Section 45
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of income (expense) related to nonoperating activities, classified as other.

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