REVENUE, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Abstract]
Net sales	$ 127,416	$ 140,710	$ 252,805	$ 258,961
Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Net sales	91,442	99,447	182,664	184,464
Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Net sales	35,974	41,263	70,141	74,497
Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	42,536	48,928	86,897	91,846
Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	40,852	45,548	79,108	83,776
Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Net sales	44,028	46,234	86,800	83,339
North America [Member]
Disaggregation of Revenue [Abstract]
Net sales	67,066	71,240	131,653	130,696
North America [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Net sales	45,442	44,055	89,323	81,951
North America [Member] | Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Net sales	21,624	27,185	42,330	48,745
North America [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	31,297	34,834	63,418	65,878
North America [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	9,638	10,158	18,583	18,209
North America [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Net sales	26,131	26,248	49,652	46,609
Asia [Member]
Disaggregation of Revenue [Abstract]
Net sales	39,324	45,914	76,601	84,535
Asia [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Net sales	32,707	39,402	63,835	72,330
Asia [Member] | Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Net sales	6,617	6,512	12,766	12,205
Asia [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	3,027	4,820	6,502	8,241
Asia [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	29,168	32,844	56,258	60,669
Asia [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Net sales	7,129	8,250	13,841	15,625
Europe [Member]
Disaggregation of Revenue [Abstract]
Net sales	21,026	23,556	44,551	43,730
Europe [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Net sales	13,293	15,990	29,506	30,183
Europe [Member] | Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Net sales	7,733	7,566	15,045	13,547
Europe [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	8,212	9,274	16,977	17,727
Europe [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Net sales	2,046	2,546	4,267	4,898
Europe [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 10,768	$ 11,736	$ 23,307	$ 21,105