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Significant Accounting Policies - Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
After Adoption of ASC 326 [Roll Forward]        
Allowance for credit losses, beginning of period $ 49,591 $ 42,956 $ 49,773 $ 30,931
Additions charged to expense 10,291 11,169 30,850 34,316
Write-offs, net of recoveries (10,604) (9,268) (31,345) (24,961)
Allowance for credit losses, end of period 49,278 44,857 49,278 44,857
Cumulative Effect Period of Adoption Adjustment        
After Adoption of ASC 326 [Roll Forward]        
Allowance for credit losses, beginning of period $ 0 $ 0 $ 0 $ 4,571