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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Provisional income tax benefit |  |  | $ 2,800
Mandatory deemed repatriation of foreign earnings |  |  | 3,800
Measurement period adjustment, income tax benefit |  | $ 700 |
Transition tax |  | 600 |
Pre-tax loss carryforwards | $ 37,000 | 37,000 |
Operating loss carryforwards, subject to expiration | 900 | 900 |
Deferred tax asset valuation allowance | (13,254) | (13,254) | (11,114)
Increase (decrease) in the valuation allowance |  | $ 2,100 | (4,200)
Provisional liability |  |  | 3,200
Undistributed earnings of foreign subsidiaries |  |  | $ 23,900
Foreign earnings repatriated | 63,000 |  |
Taxes on foreign earnings repatriated | $ 1,000 |  |

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