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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Valuation allowance | $ 12,337 | $ 17,940 | $ 12,337 |  |
Statutory rate |  | 21.00% | 35.00% | 35.00% |
Provisional net income tax benefit due to Tax Cuts and Jobs Act | 51,600 |  |  |  |
Provisional income tax benefit due to remeasurement of deferred taxes | 59,700 |  |  |  |
Provisional income tax expense due to transition tax on foreign earnings | 8,100 |  |  |  |
Decrease in deferred tax assets due to deemed mandatory repatriation | 8,100 |  |  |  |
Undistributed earnings of foreign subsidiaries |  | $ 93,200 |  |  |
Unrecognized tax benefits | $ 318 | 306 | $ 318 | $ 343 | $ 0
Income tax refunds |  |  |  | $ 28,400 |
U.S. |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforward |  | 165,600 |  |  |
Net operating loss carryforwards subject to expiration |  | 112,300 |  |  |
Valuation allowance |  | 3,000 |  |  |
Foreign |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Valuation allowance |  | $ 15,000 |  |  |

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