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Allowance for Doubtful Accounts - Notes Receivable Disaggregated by Vintage Year (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Current-period gross write-offs |  |
2021 | $ 0 | $ 0
2020 | 0 | 0
2019 | 541 | 1,748
2018 | 489 | 1,540
2017 | 2,494 | 1,970
Prior | 0 | 67
Current-period gross write-offs | 3,524 | 5,325
Current-period recoveries |  |
2021 | 0 | 0
2020 | 0 | 0
2019 | (1) | 0
2018 | 0 | 0
2017 | 0 | 0
Prior | (38) | 0
Current-period recoveries | (39) | 0
Current-period net write-offs |  |
2021 | 0 | 0
2020 | 0 | 0
2019 | 540 | 1,748
2018 | 489 | 1,540
2017 | 2,494 | 1,970
Prior | (38) | 67
Current-period net write-offs | 3,485 | 5,325
Standard notes receivable |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 16,558 | 12,592
2020 | 6,862 | 10,474
2019 | 401 | 19,185
2018 | 18,738 | 22,566
2017 | 21,288 | 28
Prior | 1,560 | 1,573
Total | 65,407 | 66,418
Current-period net write-offs |  |
Current-period net write-offs | 183 | 2,238
Elevated risk notes receivable |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 0 | 0
2020 | 0 | 617
2019 | 0 | 0
2018 | 0 | 3,969
2017 | 406 | 0
Prior | 1,374 | 1,374
Total | 1,780 | 5,960
Current-period net write-offs |  |
Current-period net write-offs | $ 3,302 | $ 3,087

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