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Geographic information (Long-lived assets by individual countries) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 37,970,285 | $ 37,255,142
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 | $ 7,965,456 | $ 7,639,347
China | Geographic Concentration Risk | Long-Lived Assets |  |
Segment Reporting Information [Line Items] |  |
Percentage of long-lived assets | 21.00% | 20.50%
United States |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 4,395,161 | $ 4,381,348
United States | Geographic Concentration Risk | Long-Lived Assets |  |
Segment Reporting Information [Line Items] |  |
Percentage of long-lived assets | 11.60% | 11.80%
Other Countries |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 25,609,668 | $ 25,234,447
Other Countries | Geographic Concentration Risk | Long-Lived Assets |  |
Segment Reporting Information [Line Items] |  |
Percentage of long-lived assets | 67.40% | 67.70%

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