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Credit Losses (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Allowance for doubtful accounts receivable $ 41,598 $ 40,393 $ 40,474   $ 29,381
Cumulative Effect on Retained Earnings, before Tax 0 2,706      
Provision for Other Credit Losses 4,744 10,248      
Accounts Receivable, Credit Loss Expense (Reversal) (3,991) (2,113)      
Accounts Receivable, Other, Including Dispositions and Foreign Currency 371 171      
Accounting Standards Update 2016-13          
Retained Earnings (Accumulated Deficit)   $ (2,112)   $ 2,100  
Retained Earnings Effect, Tax $ 600