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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, federal | $ 180,621,000 |  |
Operating loss carryforwards, state | 17,850,000 |  |
Deferred tax assets, valuation allowance | 90,278,000 | $ 102,627,000 |
Federal NOL annual utilization limit | 14,100,000 |  |
Deferred Tax Asset, Operating and Capital Loss Carryforwards and Credits | 90,871,000 | $ 83,323,000 |
Foreign tax credits, additional paid in capital benefit | $ 51,126,000 |  |
Effective Income Tax Rate Reconciliation, Percent | 12.00% | 50.00% | 3.00%
Effective tax rate excluding valuation allowance | 47.00% | (33.00%) | (28.00%)
Deferred Tax Liabilities, Other | $ 10,587,000 |  |
Federal Deferred Tax Asset, Impact of ASU 2016-09 | 21,350,000 |  |
Deferred Tax Assets, Gross | 100,889,000 | $ 102,789,000 |
Deferred Tax Assets, State Taxes | 1,559,000 |  |
Unrecognized tax benefits | 808,000 |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 0.21 |  |
Deferred Tax Asset, Revaluation | 25,261,000 |  |
Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating losses included in deferred tax assets | 2,804,000 |  |
Capital Loss Carryforward Related to Business Acquisition [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating Loss Carryforwards | $ 26,326,000 |  |

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