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Income Taxes - Domestic and Foreign (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 21,084 $ 14,531 $ 6,174
Foreign 28,435 21,350 19,212
INCOME BEFORE INCOME TAXES $ 49,519 $ 35,881 $ 25,386