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Summary of Significant Accounting Policies - Accounts Receivable and Doubtful Accounts (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning Balance $ 20,350
Increases (decreases) to Costs and Expenses (4,149)
Write-Offs Net of Recoveries (2,100)
Ending Balance 14,101
Prepaid Expense and Other Current Assets, Allowance for Credit Loss [Roll Forward]  
Beginning Balance 7,029
Increases (decreases) to Costs and Expenses 0
Write-Offs Net of Recoveries 0
Ending Balance $ 7,029