Notes Receivable and Current Expected Credit Losses (Schedule of Interest on the Mezzanine Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 3,352	$ 6,746	$ 6,920	$ 10,862
Mezzanine loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	3,239	6,639	6,697	10,650
Other notes receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	113	107	223	212
City Park 2 | Mezzanine loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	206	0	224	0
Interlock Commercial | Mezzanine loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	2,361	3,310	5,187	6,384
Nexton Multifamily | Mezzanine loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	672	261	1,286	261
Solis Apartments at Interlock | Mezzanine loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 0	3,068	$ 0	4,005
Payment for debt extinguishment		$ 2,400		$ 2,400