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Allowance for Doubtful Accounts - Notes Receivable Disaggregated by Vintage Year (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Current-period gross write-offs  
2020 $ 0
2019 0
2018 1,748
2017 1,540
2016 1,970
Prior 67
Current-period gross write-offs 5,325
Current-period recoveries  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Current-period recoveries 0
Current-period net write-offs  
2020 0
2019 0
2018 1,748
2017 1,540
2016 1,970
Prior 67
Current-period net write-offs 5,325
Standard notes receivable  
Financing Receivable, Credit Quality Indicator [Line Items]  
2020 12,592
2019 10,474
2018 19,185
2017 22,566
2016 28
Prior 1,573
Total 66,418
Current-period gross write-offs  
Current-period gross write-offs 2,238
Elevated risk notes receivable  
Financing Receivable, Credit Quality Indicator [Line Items]  
2020 0
2019 617
2018 0
2017 3,969
2016 0
Prior 1,374
Total 5,960
Current-period gross write-offs  
Current-period gross write-offs $ 3,087