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SEGMENT INFORMATION, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | $ 21,235 | $ 17,455 | $ 40,142 | $ 35,080
Capital expenditures | 15,777 | 11,823 | 28,429 | 27,751
Other [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 13,976 | 9,521 | 25,542 | 18,996
Capital expenditures | 14,090 | 9,737 | 23,805 | 23,005
Reportable Geographic Region [Member] | Mainland China [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 3,444 | 3,681 | 6,931 | 7,652
Capital expenditures | 1,029 | 760 | 2,898 | 1,663
Reportable Geographic Region [Member] | Americas/Pacific [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 279 | 484 | 493 | 1,050
Capital expenditures | 240 | 327 | 429 | 561
Reportable Geographic Region [Member] | South Korea [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 1,576 | 1,654 | 3,243 | 3,286
Capital expenditures | 44 | 16 | 44 | 464
Reportable Geographic Region [Member] | Southeast Asia [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 564 | 550 | 1,123 | 1,077
Capital expenditures | 144 | 333 | 195 | 533
Reportable Geographic Region [Member] | Japan [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 900 | 899 | 1,815 | 1,779
Capital expenditures | 72 | 21 | 383 | 97
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 321 | 344 | 644 | 646
Capital expenditures | 116 | 511 | 598 | 1,117
Reportable Geographic Region [Member] | EMEA [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 175 | 322 | 351 | 594
Capital expenditures | $ 42 | $ 118 | $ 77 | $ 311

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