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SEGMENT INFORMATION, Revenue by Segment (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Segment Market | Jun. 30, 2016 USD ($)
SEGMENT INFORMATION [Abstract] |  |  |  |
Number of markets | Market |  |  | 50 |
Number of segments | Segment |  |  | 7 |
Revenue by Segment [Abstract] |  |  |  |
Revenue | $ 550,101 | $ 600,475 | $ 1,049,200 | $ 1,072,306
Operating Segment [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | 550,101 | 600,475 | 1,049,200 | 1,072,306
Operating Segment [Member] | Mainland China [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | 172,098 | 184,344 | 322,102 | 302,999
Operating Segment [Member] | South Korea [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | 86,917 | 93,036 | 169,388 | 179,154
Operating Segment [Member] | Americas [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | 77,096 | 67,884 | 142,754 | 133,632
Operating Segment [Member] | South Asia/Pacific [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | 67,935 | 92,297 | 137,733 | 155,875
Operating Segment [Member] | Japan [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | 64,796 | 72,849 | 125,952 | 137,940
Operating Segment [Member] | Hong Kong/Taiwan [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | 43,071 | 52,372 | 79,019 | 92,428
Operating Segment [Member] | EMEA [Member] |  |  |  |
Revenue by Segment [Abstract] |  |  |  |
Revenue | $ 38,188 | $ 37,693 | $ 72,252 | $ 70,278

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