SEGMENT INFORMATION, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Summarized Financial Information [Abstract]
Depreciation and amortization	$ 17,445	$ 18,718	$ 52,525	$ 53,402
Capital expenditures	11,214	10,305	38,965	35,019
Reportable Geographic Region [Member] | Mainland China [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	3,550	4,218	11,202	12,362
Capital expenditures	688	1,711	2,351	8,709
Reportable Geographic Region [Member] | South Korea [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	1,586	1,773	4,872	5,137
Capital expenditures	0	141	464	520
Reportable Geographic Region [Member] | Americas [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	341	672	1,319	2,010
Capital expenditures	133	96	697	585
Reportable Geographic Region [Member] | South Asia/Pacific [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	585	636	1,733	1,796
Capital expenditures	284	235	814	1,978
Reportable Geographic Region [Member] | Japan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	898	1,002	2,677	2,848
Capital expenditures	109	49	206	916
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	353	558	999	1,669
Capital expenditures	2	179	1,119	444
Reportable Geographic Region [Member] | EMEA [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	226	356	820	1,027
Capital expenditures	571	131	882	798
Corporate and Other [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	9,906	9,503	28,903	26,553
Capital expenditures	$ 9,427	$ 7,763	$ 32,432	$ 21,069