SEGMENT INFORMATION, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summarized Financial Information [Abstract]
Depreciation and amortization	$ 17,455	$ 17,739	$ 35,080	$ 34,684
Capital expenditures	11,823	13,772	27,751	24,714
Reportable Geographic Region [Member] | Mainland China [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	3,681	4,117	7,652	8,144
Capital expenditures	760	2,098	1,663	6,998
Reportable Geographic Region [Member] | South Korea [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	1,654	1,723	3,286	3,364
Capital expenditures	16	109	464	379
Reportable Geographic Region [Member] | Americas [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	448	679	978	1,338
Capital expenditures	313	211	564	489
Reportable Geographic Region [Member] | South Asia/Pacific [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	585	597	1,148	1,160
Capital expenditures	347	1,466	530	1,743
Reportable Geographic Region [Member] | Japan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	899	953	1,779	1,846
Capital expenditures	21	128	97	867
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	344	547	646	1,111
Capital expenditures	511	37	1,117	265
Reportable Geographic Region [Member] | EMEA [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	322	367	594	671
Capital expenditures	118	202	311	667
Corporate and Other [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	9,522	8,756	18,997	17,050
Capital expenditures	$ 9,737	$ 9,521	$ 23,005	$ 13,306