Segment Information, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summarized Financial Information [Abstract]
Depreciation and amortization	$ 83,003	$ 71,564	$ 72,397
Capital expenditures	70,371	60,156	50,221
Reportable Geographic Region [Member] | Mainland China [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	13,036	15,122	16,775
Capital expenditures	11,658	4,539	13,656
Reportable Geographic Region [Member] | Americas/Pacific [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	988	1,746	2,837
Capital expenditures	974	800	1,171
Reportable Geographic Region [Member] | South Korea [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	6,266	6,499	6,787
Capital expenditures	285	469	556
Reportable Geographic Region [Member] | Southeast Asia [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	2,123	2,234	2,168
Capital expenditures	1,120	1,753	2,206
Reportable Geographic Region [Member] | Japan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	3,604	3,554	3,782
Capital expenditures	788	994	1,288
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	1,316	1,395	2,507
Capital expenditures	4,113	1,350	634
Reportable Geographic Region [Member] | EMEA [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	847	985	1,387
Capital expenditures	734	1,168	1,224
Corporate and Other [Member]
Summarized Financial Information [Abstract]
Depreciation and amortization	54,823	40,029	36,154
Capital expenditures	$ 50,699	$ 49,083	$ 29,486