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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
INCOME TAXES        
Income tax expense $ 2,788 $ 2,046 $ 4,796 $ 6,036
Effective tax rate (as a percent)     23.20% 33.00%
Statutory rate (as a percent)     21.00% 21.00%