INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 9,921	$ 7,653
Effective tax rate	17.80%	20.10%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,400		$ 2,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 0		$ 0