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Summary of Significant Accounting Policies - Acquisition and Integration costs (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
Accounting Policies [Abstract]          
Acquisition and Integration Costs $ 15,661 $ 0 $ 12,764 $ 0 $ 13,293