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Business Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2013
Business Segment Information [Abstract] |
Operating results for the business segments |
(in thousands) |  | IDT Energy |  |  | Genie Oil and Gas |  |  | Corporate |  |  | Total |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 71,638 |  |  | $ | — |  |  | $ | — |  |  | $ | 71,638 |
Income (loss) from operations |  |  | 9,596 |  |  |  | (3,699 | ) |  |  | (1,949 | ) |  |  | 3,948 |
Research and development |  |  | — |  |  |  | 2,653 |  |  |  | — |  |  |  | 2,653 |
Equity in the net loss of AMSO, LLC |  |  | — |  |  |  | 672 |  |  |  | — |  |  |  | 672 |
Three Months Ended September 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 63,725 |  |  | $ | — |  |  | $ | — |  |  | $ | 63,725 |
Income (loss) from operations |  |  | 8,679 |  |  |  | (3,171 | ) |  |  | (2,039 | ) |  |  | 3,469 |
Research and development |  |  | — |  |  |  | 2,264 |  |  |  | — |  |  |  | 2,264 |
Equity in the net loss of AMSO, LLC |  |  | — |  |  |  | 508 |  |  |  | — |  |  |  | 508 |
(in thousands) |  | IDT Energy |  |  | Genie Oil and Gas |  |  | Corporate |  |  | Total |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 212,103 |  |  | $ | — |  |  | $ | — |  |  | $ | 212,103 |
Income (loss) from operations |  |  | 18,972 |  |  |  | (11,507 | ) |  |  | (6,454 | ) |  |  | 1,011 |
Research and development |  |  | — |  |  |  | 7,734 |  |  |  | — |  |  |  | 7,734 |
Equity in the net loss of AMSO, LLC |  |  | — |  |  |  | 2,607 |  |  |  | — |  |  |  | 2,607 |
Nine Months Ended September 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 164,056 |  |  | $ | — |  |  | $ | — |  |  | $ | 164,056 |
Income (loss) from operations |  |  | 17,108 |  |  |  | (10,169 | ) |  |  | (5,784 | ) |  |  | 1,155 |
Research and development |  |  | — |  |  |  | 7,141 |  |  |  | — |  |  |  | 7,141 |
Equity in the net loss of AMSO, LLC |  |  | — |  |  |  | 2,252 |  |  |  | — |  |  |  | 2,252 |
Summary of business segment aggregate assets |
(in thousands) |  | IDT Energy |  |  | Genie Oil and Gas |  |  | Corporate |  |  | Total |
Total assets: |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2013 |  | $ | 68,722 |  |  | $ | 37,044 |  |  | $ | 40,410 |  |  | $ | 146,176 |
December 31, 2012 |  | $ | 65,377 |  |  | $ | 36,561 |  |  | $ | 48,368 |  |  | $ | 150,306 |

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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 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 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=6534315&loc=d3e8813-108599 Reference 3: 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=14024403&loc=d3e13816-109267 Reference 4: 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=6534315&loc=d3e8906-108599 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=6534315&loc=d3e8736-108599 + Details
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