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Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Restricted Cash        
Cash and cash equivalents $ 145,417 $ 164,164 $ 209,378  
Restricted cash 1,764 1,764 1,764  
Total cash, cash equivalents and restricted cash as shown on the statements of cash flows $ 147,181 $ 165,928 $ 211,142 $ 229,821