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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
INCOME TAXES    
Income tax expense $ 2,008 $ 3,990
Effective tax rate (as a percent) 21.80% 42.70%
Statutory rate (as a percent) 21.00% 21.00%