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Summary of Significant Accounting Policies (Allowance for doubtful accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 9,217 $ 9,048
Charged to expense 2,424 1,127
Deductions or other (527) (958)
Balance at end of period $ 11,114 $ 9,217