Receivables and Allowance for Credit Losses - Past Due Balances Of Mezzanine And Other Notes Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	$ 137,683	$ 139,317
Senior
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	108,370	104,716
Subordinated
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	27,801	33,234
Unsecured
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	1,512	1,367
1-30 days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
1-30 days Past Due | Senior
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
1-30 days Past Due | Subordinated
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
1-30 days Past Due | Unsecured
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
30-89 days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
30-89 days Past Due | Senior
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
30-89 days Past Due | Subordinated
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
30-89 days Past Due | Unsecured
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
> 90 days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	2,209	17,409
> 90 days Past Due | Senior
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	15,200
> 90 days Past Due | Subordinated
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	2,209	2,209
> 90 days Past Due | Unsecured
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
Total Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	2,209	17,409
Total Past Due | Senior
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	15,200
Total Past Due | Subordinated
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	2,209	2,209
Total Past Due | Unsecured
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	0	0
Current
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	135,474	121,908
Current | Senior
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	108,370	89,516
Current | Subordinated
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	25,592	31,025
Current | Unsecured
Financing Receivable, Credit Quality Indicator [Line Items]
Total notes receivable	$ 1,512	$ 1,367