Segment Information, Long Lived Assets by Major Market (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 597,930	$ 464,535	$ 464,587
Major Market [Member] | United States [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	354,410	317,516	302,884
Major Market [Member] | Mainland China [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	136,845	89,447	97,046
Major Market [Member] | South Korea [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	35,286	36,325	42,211
Major Market [Member] | Japan [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	12,015	6,864	9,342
Major Market [Member] | All Others [Member]
Long-Lived Assets by Major Market [Abstract]
Long-lived assets	$ 59,374	$ 14,383	$ 13,104