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INCOME TAXES - Components of Income Before Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of income before income taxes                      
Domestic                 $ 28,917 $ 25,232 $ 28,047
Foreign                 24,825 22,321 17,327
INCOME BEFORE INCOME TAXES $ 11,336 $ 27,920 $ 12,868 $ 1,618 $ 41,196 $ (21,860) $ 13,505 $ 14,712 $ 53,742 $ 47,553 $ 45,374