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Investments In Unconsolidated Joint Ventures (Narrative) (Details) (USD $)
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Sep. 30, 2013
property
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Dec. 31, 2012
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| Schedule of Equity Method Investments [Line Items] |
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| Investments in unconsolidated joint ventures |
$ 131,859,000 |
$ 132,339,000 |
| Accounts receivable from unconsolidated joint ventures |
856,000 |
370,000 |
| Number of VIEs |
5 |
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| Maximum exposure to loss |
13,700,000 |
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| Estimated future funding commitments |
3,100,000 |
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Unconsolidated Joint Venture Office Buildings [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Number of properties |
20 |
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Unconsolidated Joint Venture Office And Retail Buildings [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Area of property (in square feet) |
2,300,000 |
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Unconsolidated Joint Venture Retail Buildings [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Number of properties |
2 |
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Unconsolidated Joint Venture Multi-Family Properties [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Number of properties |
7 |
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| Number of units |
2,597 |
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Unconsolidated Joint Venture Hotel [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Number of units |
350 |
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Unconsolidated Joint Venture Commercial Property [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Area of property (in square feet) |
1,700,000 |
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Unconsolidated Joint Venture Development Projects [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Number of units |
2,631 |
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Minimum [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Percentage of interest in venture |
7.50% |
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Maximum [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Percentage of interest in venture |
80.00% |
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Variable Interest Entity [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Investments in unconsolidated joint ventures |
$ 10,700,000 |
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Apartments [Member] | Unconsolidated Joint Venture Land Parcels [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Number of units |
3,708 |
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Office [Member] | Unconsolidated Joint Venture Land Parcels [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Area of property (in square feet) |
1,200,000 |
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