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Notes Receivable and Current Expected Credit Losses (Schedule of Interest on the Mezzanine Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | $ 4,116 | $ 7,226
Mezzanine Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | 4,013 | 7,203
Other Notes Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | 103 | 23
The Residences at Annapolis Junction | Mezzanine Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | 0 | 2,468
Delray Beach Plaza | Mezzanine Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | 0 | 489
Nexton Square | Mezzanine Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | 0 | 391
Interlock Commercial | Mezzanine Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | 3,075 | 3,017
Solis Apartments at Interlock | Mezzanine Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest income | $ 938 | $ 838

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