Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details)

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Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 252,721 $ 233,351 $ 218,389  
Restricted cash 1,645   1,645  
Total cash and cash equivalents and restricted cash $ 254,366 $ 234,996 $ 220,034 $ 153,432