Allowance for Doubtful Accounts - Age Analysis of Past-Due Note Receivable (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Financing Receivable, Past Due [Line Items]
Notes Receivable	$ 8,415
0-90 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	966
91 - 180 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	620
Greater than 181 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	6,829
Standard notes receivable
Financing Receivable, Past Due [Line Items]
Notes Receivable	5,701
Standard notes receivable | 0-90 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	966
Standard notes receivable | 91 - 180 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	620
Standard notes receivable | Greater than 181 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	4,115
Elevated risk notes receivable
Financing Receivable, Past Due [Line Items]
Notes Receivable	2,714
Elevated risk notes receivable | 0-90 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	0
Elevated risk notes receivable | 91 - 180 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	0
Elevated risk notes receivable | Greater than 181 Days
Financing Receivable, Past Due [Line Items]
Notes Receivable	$ 2,714