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Business Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2018
Business Segment Information [Abstract] |
Summary of operating results for the business segments |
(in thousands) |  | GRE |  |  | Afek |  |  | GOGAS |  |  | Corporate |  |  | Total |
Three Months Ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 71,672 |  |  | $ | — |  |  | $ | 170 |  |  | $ | — |  |  | $ | 71,842 |
Income (loss) from operations |  |  | 9,208 |  |  |  | (54 | ) |  |  | (1,062 | ) |  |  | (2,046 | ) |  |  | 6,046 |
Write-down of assets held for sale to fair value |  |  | — |  |  |  | — |  |  |  | 451 |  |  |  | — |  |  |  | 451 |
Exploration |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Equity in the net loss of equity method investee |  |  | 767 |  |  |  | — |  |  |  | 94 |  |  |  | — |  |  |  | 861 |
Three Months Ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 69,473 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 69,473 |
Income (loss) from operations |  |  | 4,773 |  |  |  | (1,011 | ) |  |  | (158 | ) |  |  | (2,201 | ) |  |  | 1,403 |
Exploration |  |  | — |  |  |  | 753 |  |  |  | — |  |  |  | — |  |  |  | 753 |
Equity in net loss of Shoreditch |  |  | 159 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 159 |
Nine Months Ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 217,373 |  |  | $ | — |  |  | $ | 171 |  |  | $ | — |  |  | $ | 217,544 |
Income (loss) from operations |  |  | 22,826 |  |  |  | (541 | ) |  |  | (5,307 | ) |  |  | (6,624 | ) |  |  | 10,354 |
Write-down of assets held for sale to fair value |  |  | — |  |  |  | — |  |  |  | 2,742 |  |  |  | — |  |  |  | 2,742 |
Exploration |  |  | — |  |  |  | 244 |  |  |  | — |  |  |  | — |  |  |  | 244 |
Equity in the net loss of joint venture |  |  | 1,988 |  |  |  | — |  |  |  | 94 |  |  |  | — |  |  |  | 2,082 |
Nine Months Ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 191,126 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 191,126 |
Income (loss) from operations |  |  | 4,352 |  |  |  | (3,611 | ) |  |  | (350 | ) |  |  | (7,359 | ) |  |  | (6,968 | )
Exploration |  |  | — |  |  |  | 2,256 |  |  |  | — |  |  |  | — |  |  |  | 2,256 |
Equity in net loss of Shoreditch |  |  | 159 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 159 |
Summary of total assets for the business segments |
(in thousands) |  | GRE |  |  | Afek |  |  | GOGAS |  |  | Corporate |  |  | Total |
Total assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2018 |  | $ | 122,992 |  |  | $ | 1,228 |  |  | $ | 4,516 |  |  | $ | 2,727 |  |  | $ | 131,463 |
December 31, 2017 |  |  | 112,521 |  |  |  | 2,588 |  |  | $ | 7,887 |  |  |  | 2,782 |  |  |  | 125,778 |

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