Investments In Unconsolidated Joint Ventures (GE/Gale Funding LLC (Princeton Forrestal Village)) (Details) (PFV [Member], USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|---|
May 09, 2006
sqft | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | Dec. 16, 2010 | |
PFV [Member] | |||||||
| 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 | 0 | 371,000 | 87,000 | 992,000 | |||
| 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 | ||||||