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Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Computed income tax expense at statutory federal income tax rate $ 13,665 $ 36,522 $ 22,655
State income taxes, net of federal benefit 3,489 1,160 292
Deemed mandatory repatriation state tax (909) 1,206  
Deemed mandatory repatriation federal tax, net of foreign tax credit (1,690) 6,936  
Remeasurement of deferred taxes due to reduction in U.S. tax rate [1] (510) 8,000  
Foreign tax rate differential 4,138 (5,031) (882)
U.S. tax on current year foreign earnings, net of foreign tax credits (223) (2,726) (373)
Change in valuation allowance (653) (796) 1,230
Other adjustments, net (212) 627 (1,672)
Income tax expense $ 17,095 $ 45,898 $ 21,250
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Computed income tax expense at statutory federal income tax rate 21.00% 35.00% 35.00%
State income taxes, net of federal benefit, tax rate 5.40% 1.10% 0.50%
Deemed mandatory repatriation state tax rate (1.40%) 1.20%  
Deemed mandatory repatriation federal tax, net of foreign tax credit, tax rate (2.60%) 6.60%  
Remeasurement of deferred taxes due to reduction in U.S. tax rate, tax rate [1] (0.80%) 7.70%  
Foreign tax differentials rate 6.40% (4.80%) (1.40%)
U.S. tax on current year foreign earnings, net of foreign tax credits, tax rate (0.30%) (2.60%) (0.60%)
Change in valuation allowance, tax rate (1.00%) (0.80%) 1.90%
Other adjustments, net, tax rate (0.30%) 0.60% (2.60%)
Income tax expense 26.40% 44.00% 32.80%
[1] Included $0.6 million increase to the valuation allowance in 2017.