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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets, Employee benefits and deferred compensation | $ 1,089 | $ 1,745
Deferred tax assets, Investments and asset impairments | 1,772 | 2,619
Deferred tax assets, Other temporary differences | (686) | (807)
Deferred tax assets Net operating loss and capital loss carryforwards | 15,643 | 21,977
Deferred Tax Assets, Gross | 17,818 | 25,534
Valuation allowance | (17,818) | (25,534)
Net deferred tax assets |  |

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