INCOME TAXES - Provision for income taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 5,480	$ 4,871	$ 5,016
Federal - Deemed Repatriation	(477)	1,102	0
State	(380)	(1,435)	955
Foreign	2,719	3,653	1,965
Current income tax expense	7,342	8,191	7,936
Deferred:
Federal	571	(919)	3,057
State	(55)	150	205
Foreign	59	(99)	(43)
Deferred income tax expense	568	(868)	3,219
Income tax expense	$ 7,917	$ 7,323	$ 11,155