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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Income tax expense $ 2,887 $ 4,721 $ 5,966 $ 9,065
Income before income tax expense $ 15,104 $ 14,955 $ 31,003 $ 29,375
Effective tax rate(1) 19.10% 31.60% 19.20% 30.90%