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Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 97,568    
Provision for expected credit losses (3,728) $ 58,375 $ (19,000)
Write-offs (13,198)    
Other (2,168)    
Ending balance $ 78,474   $ 97,568