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Summary of Significant Accounting Policies Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 66,483 $ 44,555    
Restricted cash (included in "taxes, prepaid expenses and other assets") 1,014 574    
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows $ 67,497 $ 45,129 $ 114,901 $ 43,298