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Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Computed income tax expense at statutory federal income tax rate $ 5,483 $ 13,665 $ 36,522
State income taxes, net of federal benefit (173) 3,489 1,160
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 change in tax rates [1] (4,517) (510) 8,000
Foreign tax rate differential 3,122 4,138 (5,031)
U.S. tax on current year foreign earnings, net of foreign tax credits (1,792) (223) (2,726)
Change in valuation allowance 920 (653) (796)
Other adjustments, net (537) (212) 627
Income tax expense $ 2,506 $ 17,095 $ 45,898
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Computed income tax expense at statutory federal income tax rate 21.00% 21.00% 35.00%
State income taxes, net of federal benefit, tax rate (0.20%) 5.40% 1.10%
Deemed mandatory repatriation state tax rate 0.00% (1.40%) 1.20%
Deemed mandatory repatriation federal tax, net of foreign tax credit, tax rate 0.00% (2.60%) 6.60%
Remeasurement of deferred taxes due to change in tax rates, tax rate [1] (17.30%) (0.80%) 7.70%
Foreign tax differentials rate 12.00% 6.40% (4.80%)
U.S. tax on current year foreign earnings, net of foreign tax credits, tax rate (6.90%) (0.30%) (2.60%)
Change in valuation allowance, tax rate 1.80% (1.00%) (0.80%)
Other adjustments, net, tax rate (0.80%) (0.30%) 0.60%
Income tax expense 9.60% 26.40% 44.00%
[1] Included $0.6 million increase to the valuation allowance in 2017.