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INCOME TAXES - Components (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income before income taxes      
United States $ 41,220 $ 34,220 $ 22,695
Foreign 9,165 7,443 7,644
Total $ 50,385 $ 41,663 $ 30,339