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Summary of Significant Accounting Policies - Prepaid Expenses and Accrued Expenses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |  |
Interest |  | $ 124,764 | $ 131,448
Dividends |  | 190,559 | 187,867
Operating lease liabilities |  | 259,597 | 250,239
Other |  | 457,617 | 576,734
Accrued expenses and other current liabilities | $ 883,323 | $ 1,032,537 | $ 1,146,288

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