SEGMENT INFORMATION, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Summarized Financial Information [Abstract]
Depreciation and amortization	$ 22,691	$ 17,455	$ 62,833	$ 52,525
Capital expenditures	13,864	11,214	42,293	38,965
Other [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	15,994	9,906	41,536	28,902
Capital expenditures	10,528	9,427	34,333	32,432
Reportable Geographic Region [Member] | Mainland China [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	3,132	3,550	10,063	11,202
Capital expenditures	2,117	688	5,015	2,351
Reportable Geographic Region [Member] | Americas/Pacific [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	229	375	722	1,425
Capital expenditures	223	136	652	697
Reportable Geographic Region [Member] | South Korea [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	1,421	1,586	4,664	4,872
Capital expenditures	135	0	179	464
Reportable Geographic Region [Member] | Southeast Asia [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	525	551	1,648	1,628
Capital expenditures	357	281	552	814
Reportable Geographic Region [Member] | Japan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	873	898	2,688	2,677
Capital expenditures	125	109	508	206
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	279	353	923	999
Capital expenditures	31	2	629	1,119
Reportable Geographic Region [Member] | EMEA [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	238	226	589	820
Capital expenditures	$ 348	$ 571	$ 425	$ 882