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Allowance for Doubtful Accounts - Notes Receivable Disaggregated by Vintage Year (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Current-period gross write-offs |  |
2022 | $ 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Total | 0 |
Current-period recoveries |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Total | 0 |
Current-period net write-offs |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Total | 0 | $ 2,809
Standard notes receivable |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2022 | 486 |
2021 | 15,461 |
2020 | 5,588 |
2019 | 272 |
2018 | 18,715 |
Prior | 22,842 |
Total | 63,364 |
Current-period net write-offs |  |
Total | 0 | 9
Elevated risk notes receivable |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 1,715 |
Total | 1,715 |
Current-period net write-offs |  |
Total | $ 0 | $ 2,800

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