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Segment Information, Revenue by Major Market (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Market | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Information [Abstract] |  |  |
Number of major markets | Market | 4 |  |
Number of markets | Market | 45 |  |
Segment Contribution [Abstract] |  |  |
Revenue | $ 2,581,934 | $ 2,420,416 | $ 2,679,008
Major Market [Member] | Mainland China [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Revenue | 625,538 | 722,526 | 886,472
Major Market [Member] | South Korea [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Revenue | 326,478 | 329,978 | 373,357
Major Market [Member] | Japan [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Revenue | 273,681 | 260,039 | 254,939
Major Market [Member] | United States [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Revenue | 425,155 | 324,727 | 311,436
Major Market [Member] | All Others [Member] |  |  |
Segment Contribution [Abstract] |  |  |
Revenue | $ 931,082 | $ 783,146 | $ 852,804

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