Annual report pursuant to Section 13 and 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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies      
Cash and cash equivalents $ 305,744 $ 233,351  
Restricted cash 2,220 1,645  
Total cash and cash equivalents and restricted cash $ 307,964 $ 234,996 $ 153,432