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Real Estate (Narrative) (Details) |  | 9 Months Ended
--- | --- | ---
May 05, 2021 USD ($) ft² ShoppingCenter $ / ft² | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Real Estate Properties [Line Items] |  |  |
Impairment charges |  | $ 80,887,000 | $ 7,607,000
Contributed capital to joint venture |  | 3,193,000 |
Investment in Unconsolidated Joint Venture [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of commercial building | ft² | 258,000 |  |
Area of commercial space leased percentage | 100.00% |  |
Term of lease | 20 years 10 months |  |
Number of redevelopment of existing shopping centers | ShoppingCenter | 2 |  |
Initial term of construction loan | 3 years |  |
Percentage of interest in joint venture | 10.00% |  |
Development cost sold to Joint Venture |  | 8,000,000.0 |
Initial annual net rent amount to be paid upon completion of building | $ 5,400,000 |  |
Annual escalator percentage to be paid on each anniversary of rent commencement | 2.50% |  |
Operating costs, property taxes and amortization of tenant improvements | $ 8,100,000 |  |
Annual net rent amount to be paid upon completion of building | $ 13,500,000 |  |
Free rent period | 10 months |  |
Tenant credit against either annual rent or any other tenant payment obligations including tenant improvement costs, in excess of tenant improvement allowance | $ 6,800,000 |  |
Amortized over period | 240 months |  |
Investment in Unconsolidated Joint Venture [Member] | Between the 10th and 12th Lease Years [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Additional per rentable square foot tenant improvement allowance to be contributed | $ / ft² | 9.38 |  |
Investment in Unconsolidated Joint Venture [Member] | Maximum [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Construction financing maximum amount | $ 105,000,000 |  |
Joint venture contribution to be made per rentable square foot toward cost of tenant improvements | $ / ft² | 155 |  |
Investment in Unconsolidated Joint Venture [Member] | LIBOR Rate [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Construction loan initial interest | LIBOR plus 200 basis |  |
Basis spread on borrowings variable rate | 200.00% |  |
Investment in Unconsolidated Joint Venture [Member] | Office Space [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of commercial building | ft² | 240,000 |  |
Investment in Unconsolidated Joint Venture [Member] | Street-Level Retail [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of commercial building | ft² | 18,000 |  |
Dual-track Strategic Alternatives Process [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Impairment charges |  | $ 82,700,000 |

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