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Allowance for Doubtful Accounts - Notes Receivable Disaggregated by Vintage Year (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Current-period gross write-offs |  |  |  |
2022 |  |  | $ 1 |
2021 |  |  | 0 |
2020 |  |  | 0 |
2019 |  |  | 54 |
2018 |  |  | 0 |
Prior |  |  | 483 |
Total |  |  | 538 |
Current-period recoveries |  |  |  |
2022 |  |  | 0 |
2021 |  |  | 0 |
2020 |  |  | 0 |
2019 |  |  | 0 |
2018 |  |  | 0 |
Prior |  |  | 0 |
Total |  |  | 0 |
Current-period net write-offs |  |  |  |
2022 |  |  | 1 |
2021 |  |  | 0 |
2020 |  |  | 0 |
2019 |  |  | 54 |
2018 |  |  | 0 |
Prior |  |  | 483 |
Total | $ 538 | $ (39) | 538 | $ 2,770
Standard notes receivable |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2022 | 10,927 |  | 10,927 |
2021 | 12,589 |  | 12,589 |
2020 | 2,371 |  | 2,371 |
2019 | 173 |  | 173 |
2018 | 16,680 |  | 16,680 |
Prior | 22,840 |  | 22,840 |
Total | 65,580 |  | 65,580 |
Current-period net write-offs |  |  |  |
Total | 55 | 0 | 55 | 9
Elevated risk notes receivable |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2022 | 0 |  | 0 |
2021 | 0 |  | 0 |
2020 | 0 |  | 0 |
2019 | 0 |  | 0 |
2018 | 0 |  | 0 |
Prior | 1,223 |  | 1,223 |
Total | 1,223 |  | 1,223 |
Current-period net write-offs |  |  |  |
Total | $ 483 | $ (39) | $ 483 | $ 2,761

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