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Income Taxes - Tax Reform (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tax reform |  |  |  |
Statutory tax rate |  | 21.00% | 35.00% | 34.00%
Percentage of tax reform enacted |  | 15.50% |  |
Percentage of tax reform enacted remaining earnings |  | 8.00% |  |
Income tax expense on foreign earnings deemed repatriated |  |  | $ 18,200 |
Tax liability for repatriation tax | $ 10,600 |  | $ 10,600 |
Repatriation tax, period for payment |  |  | 8 years |
Long-term income taxes payable | 12,848 | $ 7,620 | $ 12,848 |
Deferred tax expense for foreign taxes on distributions from foreign subsidiaries deemed repatriated | $ 7,300 | 0 |  |
Provisional tax expense for remeasurement of net deferred tax assets |  |  | $ 2,300 |
Maximum |  |  |  |
Tax reform |  |  |  |
Incremental tax expense relating foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets |  | 100 |  |
Forecast |  |  |  |
Tax reform |  |  |  |
Reduction of provisional taxes payable |  | 500 |  |
Adjustment |  |  |  |
Tax reform |  |  |  |
Long-term income taxes payable |  | $ 2,500 |  |

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