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Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Segment | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total interest expense | $ 56 | $ 93 | $ 201 | $ 307 |
Operating income (loss) from identified segments | (25,224) | (681) | (54,670) | 715 |
General and administrative expenses | (1,824) | (2,030) | (4,524) | (5,169) |
Add back Interest expenses | 56 | 93 | 201 | 307 |
Other revenues and expenses | 1,573 | 618 | 1,036 | (472) |
Income (loss) before income taxes | (23,651) | (63) | (53,634) | 243 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 2,243 | 4,689 | 7,306 | 11,702 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 71,502 |  | 71,502 |  | $ 123,523
Reportable Segment [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 2,622 | 9,928 | 8,586 | 27,312 |
Total operating expenses | 26,022 | 8,579 | 58,732 | 21,428 |
Total interest expense | 56 | 93 | 201 | 307 |
Operating income (loss) from identified segments | (23,456) | 1,256 | (50,347) | 5,577 |
Add back Interest expenses | 56 | 93 | 201 | 307 |
Reportable Segment [Member] | Oil and gas [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 2,622 | 9,928 | 8,586 | 27,312 |
Total operating expenses | 25,187 | 7,649 | 56,437 | 19,084 |
Total interest expense | 56 | 93 | 201 | 307 |
Operating income (loss) from identified segments | (22,621) | 2,186 | (48,052) | 7,921 |
Add back Interest expenses | 56 | 93 | 201 | 307 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 2,176 | 4,621 | 7,105 | 11,498 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 43,389 |  | 43,389 |  | 92,020
Reportable Segment [Member] | Mineral properties [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total operating expenses | 835 | 930 | 2,295 | 2,344 |
Total interest expense | 0 | 0 | 0 | 0 |
Operating income (loss) from identified segments | (835) | (930) | (2,295) | (2,344) |
Add back Interest expenses | 0 | 0 | 0 | 0 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 31 | 31 | 93 | 92 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 21,944 |  | 21,944 |  | 21,942
Corporate, Non-Segment [Member] |  |  |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 36 | $ 37 | 108 | $ 112 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | $ 6,169 |  | $ 6,169 |  | $ 9,561

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