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Real Estate (Narrative) (Details) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 02, 2022 USD ($) property | Oct. 14, 2021 USD ($) | May 05, 2021 USD ($) ft² ShoppingCenter $ / ft² | Jun. 19, 2019 USD ($) | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of properties | property |  |  |  |  | 50 |  |
Impairment charges |  |  |  |  | $ 99,888,000 | $ 7,607,000 | $ 8,938,000
Impairment charges, assets held for use | $ 83,200,000 |  |  |  |  |  |
Impairment charges, assets held for sale | $ 18,500,000 |  |  |  |  |  |
Contributed capital to joint venture |  |  |  |  | 4,654,000 |  |
Purchase price |  |  |  |  |  |  | 9,083,000
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 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of properties | property | 33 |  |  |  |  |  |
Proceeds from sale of grocery-anchored shopping centers | $ 840,000,000.0 |  |  |  |  |  |
Aggregate price to backstop redevelopment transaction | 80,500,000 |  |  |  |  |  |
Dual-track Strategic Alternatives Process [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  |  |  | 83,200,000 |  |
Impairment charges, assets held for sale |  |  |  |  | 18,500,000 |  |
Dual-track Strategic Alternatives Process [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Impairment charges | 101,700,000 |  |  |  |  |  |
Revelry Redevelopment Project [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Proceeds from sale of grocery-anchored shopping centers | 34,000,000.0 |  |  |  |  |  |
Northeast Heights Redevelopment Project [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Proceeds from sale of grocery-anchored shopping centers | 46,500,000 |  |  |  |  |  |
Remaining Assets [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Proceeds from sale of grocery-anchored shopping centers | $ 291,300,000 |  |  |  |  |  |
San Souci Plaza [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Minority ownership |  | 60.00% |  |  |  |  |
Purchase price |  | $ 300,000 |  |  |  |  |
Girard Plaza [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  | $ 8,500,000 |  |  |
Metro Square [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | 7,200,000 |
Real Estate Held for Sale [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 400,000 | $ 8,900,000
Reversal of impairment charges |  |  |  |  | $ 1,800,000 |  |

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