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Investments In Unconsolidated Joint Ventures (Red Bank Corporate Plaza) (Details) (Red Bank Corporate Plaza [Member], USD $)
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0 Months Ended | 1 Months Ended | 12 Months Ended | ||
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Sep. 22, 2011
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May 31, 2011
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Dec. 31, 2011
sqft
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Dec. 31, 2010
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Dec. 31, 2009
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| Schedule of Equity Method Investments [Line Items] | |||||
| Percentage of interest in venture | 50.00% | ||||
| Mortgage loans, carrying amount | $ 20,300,000 | ||||
| New mortgage loan | 18,100,000 | ||||
| Fixed interest rate | 3.99375% | ||||
| Mortgage loan, maturity date | May 17, 2016 | ||||
| Repayment of mortgage loan | 1,700,000 | ||||
| Area of office property | 92,878 | ||||
| Spread over LIBOR | 300 | ||||
| LIBOR interest rate | 0.29% | ||||
| Percentage of loan principal swapped | 75.00% | ||||
| Management, leasing and other services fees | $ 100,000 | $ 91,000 | $ 92,600 | ||
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Previous Mortgage Loan [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||
| Spread over LIBOR | 125 | ||||