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INCOME TAXES - Components of income before income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Before Income Taxes      
United States $ 22,695 $ 25,038 $ 19,850
Foreign 7,644 6,039 5,013
Total $ 30,339 $ 31,077 $ 24,863