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Income Taxes - Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax expense computed at federal statutory income tax rate $ 34,685 $ 31,564 $ 53,086
Foreign taxes, net of credits 714 13,316 (16,840)
Impact of the 2017 Tax Act 0 10,801 12,619
Net adjustments for uncertain tax positions 799 771 508
State and local taxes 1,832 2,349 1,313
Equity appreciation rights 0 0 (765)
Nondeductible expenses 1,179 962 1,407
Valuation allowance 2,882 (10,038) 90
Tax credits (607) (2,800) (3,240)
Miscellaneous other, net (884) 307 297
Total income tax expense $ 40,600 $ 47,232 $ 48,475
Effective income tax rate 24.60% 31.40% 32.00%