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Business Segment Information (Tables) | 12 Months Ended
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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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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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