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v3.21.2

Borrowings (Union Square Construction Financing) (Narrative) (Details) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 08, 2019 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 29, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
(Increase) decrease in prepaid and other assets |  | $ (2,272,000) | $ 3,056,000 |  |
Contractual facility |  | $ 269,953,000 |  | $ 300,449,000 |
Union Square Construction Financing [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 57,500,000
Interest rate |  | 17.50% |  |  |
Contractual facility |  |  |  | $ 50,000,000 |
Maturity date |  |  |  | Mar. 31, 2021 |
Union Square Construction Financing [Member] | Mezzanine Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | 7,500,000
Proceeds from (Repayments of) Long-term Debt and Capital Securities | $ (7,500,000) |  |  |  |
Union Square Construction Financing [Member] | Non-Mezzanine Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 50,000,000.0
Number of extension options exercised | item |  | 2 |  |  |
Extension period |  | 1 year |  |  |
Union Square Construction Financing [Member] | Emerald Creek Capital [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 55,000,000.0 |  |  |
Payment schedule |  | 1 year |  |  |
Number of extension options | item |  | 2 |  |  |
Extension period |  | 12 months |  |  |
Line of credit facility, term |  | 3 years |  |  |
Floor Rate [Member] | Union Square Construction Financing [Member] | Emerald Creek Capital [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 7.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Union Square Construction Financing [Member] | Emerald Creek Capital [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 6.90% |  |  |

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