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Segment Information, Revenue by Segment (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Segment Market | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Information [Abstract] |  |  |
Number of markets | Market | 50 |  |
Number of segments | Segment | 7 |  |
Revenue by Segment [Abstract] |  |  |
Revenue | $ 2,279,099 | $ 2,207,797 | $ 2,247,047
Operating Segment [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | 2,279,099 | 2,207,797 | 2,247,047
Operating Segment [Member] | Mainland China [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | 716,991 | 610,414 | 565,527
Operating Segment [Member] | South Korea [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | 361,692 | 413,696 | 422,341
Operating Segment [Member] | Americas [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | 317,380 | 276,590 | 329,668
Operating Segment [Member] | South Asia/Pacific [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | 299,980 | 296,758 | 321,971
Operating Segment [Member] | Japan [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | 256,085 | 279,042 | 264,214
Operating Segment [Member] | Hong Kong/Taiwan [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | 166,696 | 183,979 | 206,140
Operating Segment [Member] | EMEA [Member] |  |  |
Revenue by Segment [Abstract] |  |  |
Revenue | $ 160,275 | $ 147,318 | $ 137,186

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