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Summary of Significant Accounting Policies Effects of New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Additions, Charged to Income $ 3,827  
Additions, Other Accounts 613  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction (992)  
Accounts Receivable, Allowance for Credit Losses, Current, Disclosure $ 4,785 $ 1,337