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Significant Accounting Policies - Doubtful Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Prior to Adoption of ASC 326 [Roll Forward] |  |  |
Allowance for credit losses, beginning of period | $ 30,931 | $ 28,457 | $ 12,687
Additions charged to expense |  | 49,072 | 37,704
Additions from merger |  | 2,207 | 6,601
Write-offs, net of recoveries |  | (48,805) | (28,535)
Allowance for credit losses, end of period |  | 30,931 | $ 28,457
After Adoption of ASC 326 [Roll Forward] |  |  |
Allowance for credit losses, beginning of period | 30,931 |  |
Additions charged to expense | 49,130 |  |
Additions from merger | 3,503 |  |
Write-offs, net of recoveries | (38,362) |  |
Allowance for credit losses, end of period | 49,773 | 30,931 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
After Adoption of ASC 326 [Roll Forward] |  |  |
Allowance for credit losses, beginning of period | $ 4,571 |  |
Allowance for credit losses, end of period |  | $ 4,571 |

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