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Summary of Significant Accounting Policies - Prepaid Expenses and Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounting Policies [Abstract] |  |
Interest | $ 131,448 | $ 97,987
Sales tax and VAT payable | 131,780 | 115,352
Dividends | 187,867 | 186,021
Operating lease liabilities | 250,239 | 223,249
Other | 444,954 | 339,143
Accrued expenses | $ 1,146,288 | $ 961,752
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