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Significant Accounting Policies (Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Significant Accounting Policies        
Cash and cash equivalents $ 107,369 $ 109,618 $ 129,923  
Restricted cash 1,000   1,000  
Total cash, cash equivalents and restricted cash $ 108,369 $ 110,618 $ 130,923 $ 98,804