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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