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Investments In Unconsolidated Joint Ventures (Narrative) (Details) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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| Schedule of Equity Method Investments [Line Items] |
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| Investments in unconsolidated joint ventures |
$ 179,656,000 |
$ 181,129,000 |
| Accounts receivable due from unconsolidated joint ventures |
504,000 |
523,000 |
| Maximum exposure to loss |
18,200,000 |
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| Estimated future funding commitments |
8,800,000 |
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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 |
21 |
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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) |
2,600,000 |
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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 |
2,976 |
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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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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 |
$ 9,400,000 |
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| Number of VIEs |
6 |
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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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