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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

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