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Segment Information, Long Lived Assets by Major Market (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 464,535	$ 464,587	$ 444,732
Major Markets [Member] | United States [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	317,516	302,884	283,868
Major Markets [Member] | Mainland China [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	89,447	97,046	97,867
Major Markets [Member] | South Korea [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	36,325	42,211	41,545
Major Markets [Member] | Japan [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	6,864	9,342	11,517
Major Markets [Member] | All Others [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 14,383	$ 13,104	$ 9,935

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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