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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |
Operating loss carryforwards, federal | $ 222,861,000 |
Operating loss carryforwards, state | 19,471,000 |
Deferred tax assets, valuation allowance | 112,532,000 | $ 90,278,000
Deferred Tax Asset, Operating and Capital Loss Carryforwards and Credits | 104,862,000 | $ 90,871,000
Foreign tax credits, additional paid in capital benefit | $ 51,508,000 |
Effective Income Tax Rate Reconciliation, Percent | (1.00%) | 12.00%
Effective tax rate excluding valuation allowance | 19.00% | 47.00%
Deferred Tax Assets, Deferred Income | $ 2,455,000 |
Deferred Tax Liabilities, Other | 10,587,000 |
Federal Deferred Tax Asset, Impact of ASU 2016-09 | 21,350,000 |
Deferred Tax Assets, Gross | 112,532,000 | $ 100,889,000
Deferred Tax Assets, State Taxes | 1,559,000 |
Unrecognized tax benefits | 808,000 |
Deferred Tax Asset, Revaluation | 25,261,000 |
Domestic Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Net operating losses included in deferred tax assets | $ 19,952,000 |

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