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Revenue - Changes in the Allowance for Doubtful Accounts (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Provision for bad debt expense $ 50,506
Write-offs, net of recoveries(2) (34,425)
Balance as of June 30, 2020 $ 59,041