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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

X

- Definition

The number of markets in which the entity sells and distributes its products through a global network of customers and sales leaders.

+ References

No definition available.

+ Details

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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+ Details

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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