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Investments In Unconsolidated Joint Ventures (Gale Kimball, L.L.C.) (Details) (Gale Kimball [Member], USD $)
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12 Months Ended | |||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Jun. 15, 2006
sqft
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Gale Kimball [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Percentage of interest in venture | 8.33% | |||
| Date of acquisition | June 15, 2006 | |||
| Area of office property | 175,000 | |||
| Venture sale of real estate | $ 60,000,000 | |||
| Management, leasing and other services fees | 262,000 | 234,000 | ||
| Share of gain on sale of real estate | 1,600,000 | |||
| Venture gain (loss) on sale of real estate | 19,800,000 | |||
| Distribution received | 5,400,000 | |||
| Payment of Participation Rights | $ 2,400,000 | |||