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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Jan. 01, 2021
Accounting Policies [Abstract]      
Lease liability $ 46,676   $ 49,700
Operating lease right-of-use assets $ 31,252   $ 33,400
Market value threshold to qualify as an emerging growth company   $ 700,000