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Segment Information, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | $ 71,564 | $ 72,397 | $ 71,365
Capital expenditures | 60,156 | 50,221 | 56,622
Reportable Geographic Region [Member] | Mainland China [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 15,122 | 16,775 | 18,503
Capital expenditures | 4,539 | 13,656 | 21,998
Reportable Geographic Region [Member] | South Korea [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 6,499 | 6,787 | 5,882
Capital expenditures | 469 | 556 | 9,983
Reportable Geographic Region [Member] | Americas [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 1,608 | 2,617 | 2,545
Capital expenditures | 744 | 1,095 | 400
Reportable Geographic Region [Member] | South Asia/Pacific [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 2,372 | 2,388 | 2,022
Capital expenditures | 1,809 | 2,282 | 2,959
Reportable Geographic Region [Member] | Japan [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 3,554 | 3,782 | 3,434
Capital expenditures | 994 | 1,288 | 1,903
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 1,395 | 2,507 | 2,132
Capital expenditures | 1,350 | 634 | 1,345
Reportable Geographic Region [Member] | EMEA [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 985 | 1,387 | 1,498
Capital expenditures | 1,168 | 1,224 | 1,430
Corporate and Other [Member] |  |  |
Summarized Financial Information [Abstract] |  |  |
Depreciation and amortization | 40,029 | 36,154 | 35,349
Capital expenditures | $ 49,083 | $ 29,486 | $ 16,604

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