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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Income tax expense $ 3,238 $ 5,478 $ 9,204 $ 14,543
Income before income tax expense $ 17,295 $ 16,817 $ 48,298 $ 46,192
Effective tax rate(1) 18.70% 32.60% 19.10% 31.50%