REVENUE, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	$ 146,489	$ 126,386	$ 405,451	$ 371,671
Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	108,951		293,416
Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	37,538		112,035
Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	48,526		140,373
Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	52,972		136,748
Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	44,991		128,330
North America [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	70,654	59,537	201,351	184,873
North America [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	46,802		128,754
North America [Member] | Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	23,852		72,597
North America [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	34,919		100,797
North America [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	10,586		28,795
North America [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	25,149		71,759
Asia [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	53,528	45,919	138,062	127,801
Asia [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	46,965		119,294
Asia [Member] | Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	6,563		18,768
Asia [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	5,293		13,533
Asia [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	40,100		100,769
Asia [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	8,135		23,760
Europe [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	22,307	$ 20,930	66,038	$ 58,997
Europe [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	15,184		45,368
Europe [Member] | Through Distribution [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	7,123		20,670
Europe [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	8,314		26,043
Europe [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	2,286		7,184
Europe [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Abstract]
Disaggregation of revenue	$ 11,707		$ 32,811