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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Current-period gross write-offs        
2021     $ 0  
2020     0  
2019     0  
2018     315  
2017     2,494  
Prior     0  
Total     2,809  
Current-period recoveries        
2021     0  
2020     0  
2019     (1)  
2018     0  
2017     0  
Prior     (38)  
Total     (39)  
Current-period net write-offs        
2021     0  
2020     0  
2019     (1)  
2018     315  
2017     2,494  
Prior     (38)  
Total $ (39) $ 2,168 2,770 $ 2,168
Standard notes receivable        
Financing Receivable, Credit Quality Indicator [Line Items]        
2021 415   415  
2020 9,315   9,315  
2019 13,728   13,728  
2018 19,026   19,026  
2017 21,577   21,577  
Prior 1,562   1,562  
Total 65,623   65,623  
Current-period net write-offs        
Total 0 1,721 9 1,721
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 $ (39) $ 447 $ 2,761 $ 447