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Summary of Significant Accounting Policies - Stock-Based Compensation Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock-based awards, unrecognized compensation costs on nonvested awards | $ 85,449 |  | $ 42,559 |  |
Stock-based Compensation Expense [Abstract] |  |  |  |  |
Stock-based compensation | 11,341 | $ 10,953 | 61,001 | $ 37,674 | $ 35,654
Restricted Stock Units (RSUs) |  |  |  |  |
Summary of option activity |  |  |  |  |
Total fair value of shares or units vested | 18,415 | 19,861 | 29,332 | 26,492 | 21,191
Performance Units |  |  |  |  |
Summary of option activity |  |  |  |  |
Total fair value of shares or units vested | $ 4,346 | $ 5,591 | $ 29,701 | $ 11,812 | $ 6,503

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