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Geographic information (Long-lived assets by individual countries) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 36,641,664 | $ 37,970,285
Geographic Concentration Risk | Long-Lived Assets |  |
Segment Reporting Information [Line Items] |  |
Percentage of long-lived assets | 100.00% | 100.00%
China |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 7,472,852 | $ 7,965,456
China | Geographic Concentration Risk | Long-Lived Assets |  |
Segment Reporting Information [Line Items] |  |
Percentage of long-lived assets | 20.40% | 21.00%
United States |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 4,257,232 | $ 4,395,161
United States | Geographic Concentration Risk | Long-Lived Assets |  |
Segment Reporting Information [Line Items] |  |
Percentage of long-lived assets | 11.60% | 11.60%
Other countries |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 24,911,580 | $ 25,609,668
Other countries | Geographic Concentration Risk | Long-Lived Assets |  |
Segment Reporting Information [Line Items] |  |
Percentage of long-lived assets | 68.00% | 67.40%

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