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Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Business Segment Information [Abstract]

Summary of operating results for the business segments

(in thousands)		GRE			Afek				GOGAS				Corporate				Total
Year ended December 31, 2015
Revenues		$	210,109		$	—			$	—			$	—			$	210,109
Income (loss) from operations			13,542			(7,458	)			(3,058	)			(8,908	)			(5,882	)
Depreciation			245			104				78				1				428
Research and development			—			63				1,922				—				1,985
Exploration			—			6,583				—				—				6,583
Equity in the net loss of AMSO, LLC			—			—				397				—				397
Year ended December 31, 2014
Revenues		$	275,031		$	—			$	—			$	—			$	275,031
Income (loss) from operations			3,516			(7,294	)			(6,479	)			(15,353	)			(25,610	)
Depreciation			24			8				99				1				132
Research and development			—			144				5,394				—				5,538
Exploration			—			6,971				—				—				6,971
Goodwill impairment			3,562			—				—				—				3,562
Equity in the net loss of AMSO, LLC			—			—				—				—				—
Year ended December 31, 2013
Revenues		$	279,174		$	—			$	—			$	—			$	279,174
Income (loss) from operations			25,696			(4,255	)			(11,700	)			(9,115	)			626
Depreciation			15			2				92				1				110
Research and development			—			186				7,171				—				7,357
Exploration			—			4,032				—				—				4,032
Equity in the net loss of AMSO, LLC			—			—				3,194				—				3,194

Summary of business segment aggregate assets

(in thousands)		GRE			Afek			GOGAS			Corporate			Total
Total assets:
December 31, 2015		$	80,177		$	38,665		$	17,770		$	19,203		$	155,815
December 31, 2014			78,254			6,243			48,899			19,532			152,928
December 31, 2013			76,691			5,597			36,596			39,959			158,843

Schedule of net long-lived assets and total assets held outside of the United States

(in thousands)		United States			Foreign Countries			Total
December 31, 2015
Long-lived assets, net		$	763		$	646		$	1,409
Total assets			114,880			40,935			155,815
December 31, 2014
Long-lived assets, net		$	834		$	1,230		$	2,064
Total assets			143,897			9,031			152,928
December 31, 2013
Long-lived assets, net		$	352		$	377		$	729
Total assets			150,315			8,528			158,843

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Tabular disclosure of the names of foreign countries in which material long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets are located, and amount of such long-lived assets located in that country or foreign geographic area.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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