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Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. federal statutory rate     21.00%
Tax at the U.S. federal statutory rate $ 30,177 $ 47,168 $ 43,115
U.S. state income tax, net of federal tax benefit of $522, $652 and $644, respectively 1,965 2,452 2,422
Federal Income tax provision (benefit) for state income taxes 522 652 644
Net incremental income tax expense from foreign earnings (1) 5,732 6,314 6,031
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount 0 0 (1,494)
Non-deductible compensation expense 1,050 2,074 1,827
Other taxes and adjustments, net 59 885 (561)
Provision for income taxes $ 37,120 $ 59,993 $ 52,103
Effective tax rate 25.80% 26.70% 25.40%
Foreign inflation index adjustment $ 2,000 $ 2,300 $ 3,300
Other Tax Expense (Benefit) $ (1,863) $ 1,100 $ 763