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v3.20.2

Significant Accounting Policies - Doubtful Accounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Prior to Adoption of ASC 326 [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning of period |  | $ 30,733 |  | $ 28,457 | $ 28,457
Additions charged to expense |  | 12,111 |  | 35,893 |
Adjustment to value of acquired receivables |  | 0 |  | 2,207 |
Write-offs, net of recoveries |  | (11,314) |  | (35,027) |
Allowance for credit losses, end of period |  | $ 31,530 |  | $ 31,530 |
After Adoption of ASC 326 [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning of period | $ 42,956 |  | $ 30,931 |  |
Additions charged to expense | 11,169 |  | 34,316 |  |
Adjustment to value of acquired receivables | 0 |  | 0 |  |
Write-offs, net of recoveries | (9,268) |  | (24,961) |  |
Allowance for credit losses, end of period | 44,857 |  | 44,857 |  | $ 30,931
Accounting standards update |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member
Cumulative Effect Period of Adoption Adjustment |  |  |  |  |
After Adoption of ASC 326 [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning of period | $ 0 |  | $ 4,571 |  |
Allowance for credit losses, end of period |  |  |  |  | $ 4,571

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