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Summary of Significant Accounting Policies - Allowance for Credit Loss (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at December 31, 2019 $ 42,856
Credit memos charged to revenue 42,713
Allowance for bad debts charged to expense 25,715
Deductions and other (57,496)
Balance at September 30, 2020 $ 53,788