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Notes Receivable and Current Expected Credit Losses (Summary of Mezzanine Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable guarantee premium | $ 2,206 | $ 2,631 |  |
Allowance for credit losses | (1,741) | (2,584) | $ (3,202) | $ 0
Total notes receivable | 133,206 | 135,432 |  |
Interlock Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Additional funds available | 7,500 |  |  |
Mezzanine Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable | 125,829 | 128,576 |  |
Maximum loan commitment | 161,100 |  |  |
Mezzanine Loan | Delray Beach Plaza |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable | 0 | 14,289 |  |
Maximum loan commitment | $ 17,000 |  |  |
Interest rate | 15.00% |  |  |
Mezzanine Loan | Interlock Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable | $ 95,922 | 85,318 |  |
Maximum loan commitment | $ 103,000 |  |  |
Interest rate | 15.00% |  |  |
Additional funds available | $ 3,000 |  |  |
Interest rate | 18.00% |  |  |
Mezzanine Loan | Solis Apartments at Interlock |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable | $ 29,907 | 28,969 |  |
Maximum loan commitment | $ 41,100 |  |  |
Interest rate | 13.00% |  |  |
Other Notes Receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Notes receivable | $ 6,912 | $ 6,809 |  |

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