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Segment Information, Revenue by Major Market (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Market	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Information [Abstract]
Number of major markets | Market	3
Number of markets | Market	50
Segment Contribution [Abstract]
Revenue	$ 2,279,099	$ 2,207,797	$ 2,247,047
United States [Member]
Segment Contribution [Abstract]
Revenue	218,734	201,239	243,748
All Others [Member]
Segment Contribution [Abstract]
Revenue	725,597	703,406	751,217
Major Market [Member] | Mainland China [Member]
Segment Contribution [Abstract]
Revenue	716,991	610,414	565,527
Major Market [Member] | South Korea [Member]
Segment Contribution [Abstract]
Revenue	361,692	413,696	422,341
Major Market [Member] | Japan [Member]
Segment Contribution [Abstract]
Revenue	$ 256,085	$ 279,042	$ 264,214

X

- Definition

The number of major markets from which the entity generates revenue greater than 10% of consolidated total revenue.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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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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