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Allowance for Doubtful Accounts - Notes Receivable Disaggregated by Vintage Year (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Current-period gross write-offs        
2021     $ 0  
2020     0  
2019     0  
2018     315  
2017     2,493  
Prior     0  
Total     2,808  
Current-period recoveries        
2021     0  
2020     0  
2019     (1)  
2018     0  
2017     0  
Prior     (37)  
Total     (38)  
Current-period net write-offs        
2021     0  
2020     0  
2019     (1)  
2018     315  
2017     2,493  
Prior     (37)  
Total $ 0 $ 253 2,770 $ 2,421
Standard notes receivable        
Financing Receivable, Credit Quality Indicator [Line Items]        
2021 11,414   11,414  
2020 8,181   8,181  
2019 2,060   2,060  
2018 18,980   18,980  
2017 21,289   21,289  
Prior 1,560   1,560  
Total 63,484   63,484  
Current-period net write-offs        
Total 0 253 9 1,974
Elevated risk notes receivable        
Financing Receivable, Credit Quality Indicator [Line Items]        
2021 0   0  
2020 0   0  
2019 617   617  
2018 0   0  
2017 723   723  
Prior 1,374   1,374  
Total 2,714   2,714  
Current-period net write-offs        
Total $ 0 $ 0 $ 2,761 $ 447