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SEGMENT INFORMATION, Depreciation and Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | $ 17,455 | $ 17,739 | $ 35,080 | $ 34,684
Capital expenditures | 11,823 | 13,772 | 27,751 | 24,714
Reportable Geographic Region [Member] | Mainland China [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 3,681 | 4,117 | 7,652 | 8,144
Capital expenditures | 760 | 2,098 | 1,663 | 6,998
Reportable Geographic Region [Member] | South Korea [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 1,654 | 1,723 | 3,286 | 3,364
Capital expenditures | 16 | 109 | 464 | 379
Reportable Geographic Region [Member] | Americas [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 448 | 679 | 978 | 1,338
Capital expenditures | 313 | 211 | 564 | 489
Reportable Geographic Region [Member] | South Asia/Pacific [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 585 | 597 | 1,148 | 1,160
Capital expenditures | 347 | 1,466 | 530 | 1,743
Reportable Geographic Region [Member] | Japan [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 899 | 953 | 1,779 | 1,846
Capital expenditures | 21 | 128 | 97 | 867
Reportable Geographic Region [Member] | Hong Kong/Taiwan [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 344 | 547 | 646 | 1,111
Capital expenditures | 511 | 37 | 1,117 | 265
Reportable Geographic Region [Member] | EMEA [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 322 | 367 | 594 | 671
Capital expenditures | 118 | 202 | 311 | 667
Corporate and Other [Member] |  |  |  |
Summarized Financial Information [Abstract] |  |  |  |
Depreciation and amortization | 9,522 | 8,756 | 18,997 | 17,050
Capital expenditures | $ 9,737 | $ 9,521 | $ 23,005 | $ 13,306

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