Segment Information, Revenue by Major Market (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Market	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Information [Abstract]
Number of major markets | Market	4
Number of markets | Market	45
Segment Contribution [Abstract]
Revenue	$ 2,420,416	$ 2,679,008	$ 2,279,099
Major Market [Member]
Segment Contribution [Abstract]
Revenue	2,298,362	2,588,402	2,279,099
Major Market [Member] | Mainland China [Member]
Segment Contribution [Abstract]
Revenue	722,526	886,472	716,991
Major Market [Member] | South Korea [Member]
Segment Contribution [Abstract]
Revenue	329,978	373,357	361,692
Major Market [Member] | Japan [Member]
Segment Contribution [Abstract]
Revenue	260,039	254,939	256,085
Major Market [Member] | United States [Member]
Segment Contribution [Abstract]
Revenue	324,727	311,436	218,734
Major Market [Member] | All Others [Member]
Segment Contribution [Abstract]
Revenue	$ 783,146	$ 852,804	$ 725,597