Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Restricted Cash) (Details)

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Summary of Significant Accounting Policies (Restricted Cash) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 585,575 $ 84,441 $ 97,187  
Restricted cash 4,556 3,777 3,000  
Total cash, cash equivalents and restricted cash in the Condensed Statements of Cash Flows $ 590,131 $ 88,218 $ 100,187 $ 53,436