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Commitments And Contingencies (Other) (Narrative) (Details) (USD $)
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3 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Aug. 01, 2014
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Apr. 01, 2015
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Dec. 31, 2014
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| Commitments And Contingencies [Line Items] |
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| Amount outstanding |
$ 42,000,000 |
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$ 0 |
| Investment in unconsolidated joint ventures |
20,880,000 |
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1,889,000 |
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| Development of rental property |
12,519,000 |
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7,357,000 |
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| Purchase price of property |
19,658,000 |
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14,600,000 |
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| Eastchester Project [Member] |
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| Commitments And Contingencies [Line Items] |
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| Percentage of interest in venture |
76.25% |
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| Number of units |
108 |
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| Project costs incurred to date |
15,400,000 |
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| Amount of project costs funded by members |
20,900,000 |
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| Total project costs |
50,000,000 |
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| Property Lock-Ups [Member] |
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| Commitments And Contingencies [Line Items] |
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| Number of properties |
7 |
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| Properties aggregate net book value |
124,600,000 |
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| Expiration year |
2016 |
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| Property Lock-Ups Expired [Member] |
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| Commitments And Contingencies [Line Items] |
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| Number of properties |
110 |
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| Properties aggregate net book value |
1,300,000,000 |
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| Harborside Unit A Urban Renewal, LLC [Member] |
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| Commitments And Contingencies [Line Items] |
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| Percentage of interest in venture |
85.00% |
[1] |
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| Development costs |
88,800,000 |
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| Number of units |
763 |
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| Maximum borrowing capacity |
192,000,000 |
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| Amount outstanding |
0 |
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| Interest rate |
5.197% |
[2] |
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5.197% |
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| Harborside Unit A Urban Renewal, LLC [Member] | Harborside Residential Project [Member] |
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| Commitments And Contingencies [Line Items] |
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| Total project costs |
320,000,000 |
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| Harborside Unit A Urban Renewal, LLC [Member] | Construction Loan [Member] |
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| Commitments And Contingencies [Line Items] |
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| Maximum borrowing capacity |
192,000,000 |
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| Mortgage loan, maturity date |
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Aug. 01, 2029 |
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| Harborside Unit A Urban Renewal, LLC [Member] | Parent Company [Member] |
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| Commitments And Contingencies [Line Items] |
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| Total project costs |
42,200,000 |
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| 150 Main Street, L.L.C. [Member] | Construction Loan [Member] | Eastchester Project [Member] |
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| Commitments And Contingencies [Line Items] |
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| Maximum borrowing capacity |
28,800,000 |
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| Amount outstanding |
2,000,000 |
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| Wegmans Food Markets, Inc. [Member] |
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| Commitments And Contingencies [Line Items] |
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| Costs of the project incurred |
9,300,000 |
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| Delivery date to tenant |
2016 |
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| Area of property (in square feet) |
140,000 |
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| Wegmans Food Markets, Inc. [Member] | Scenario, Forecast [Member] |
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| Commitments And Contingencies [Line Items] |
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| Total project costs |
25,300,000 |
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| Multi-Family Properties [Member] |
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| Commitments And Contingencies [Line Items] |
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| Number of units |
5,861 |
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| Subsequent Event [Member] | City Square Project [Member] |
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| Commitments And Contingencies [Line Items] |
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| Number of units |
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370 |
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| Total project costs |
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88,000,000 |
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| Purchase price of property |
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3,100,000 |
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| Contingent consideration |
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$ 1,250,000 |
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| Minimum project start period |
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12 months |
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