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Investments In Unconsolidated Joint Ventures (GE/Gale Funding LLC (Princeton Forrestal Village)) (Details) (USD $)
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12 Months Ended | 0 Months Ended | ||||
|---|---|---|---|---|---|---|
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Dec. 31, 2011
PFV [Member]
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Dec. 31, 2010
PFV [Member]
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Dec. 31, 2009
PFV [Member]
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Dec. 16, 2010
PFV [Member]
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May 09, 2006
PFV [Member]
sqft
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May 09, 2006
GE Gale [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||||
| Percentage of interest in venture | 10.00% | |||||
| Area of office property | 527,015 | |||||
| Venture sale of real estate | $ 55,000,000 | |||||
| Management, leasing and other services fees | 87,000 | 1,400,000 | 1,100,000 | |||
| Acquisition cost | 1,800,000 | |||||
| Share of gain on sale of real estate | 41,000 | |||||
| Venture gain (loss) on sale of real estate | $ 207,000 | |||||