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Investments In Unconsolidated Joint Ventures (Gale Jefferson, L.L.C.) (Narrative) (Details) (USD $)
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0 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | |||
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Jul. 15, 2013
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Sep. 30, 2013
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Sep. 30, 2013
One Jefferson [Member]
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Jan. 04, 2013
Gale Jefferson, L.L.C. [Member]
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Sep. 30, 2013
Gale Jefferson, L.L.C. [Member]
sqft
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Sep. 30, 2012
Gale Jefferson, L.L.C. [Member]
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Sep. 30, 2013
Gale Jefferson, L.L.C. [Member]
sqft
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Sep. 30, 2012
Gale Jefferson, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||||||
| Percentage of interest in venture | 8.33% | |||||||
| Rentable Square Feet | 100,010 | 100,010 | ||||||
| Lease expiration date | Aug. 01, 2025 | |||||||
| Mortgage loans, carrying amount | $ 20,200,000 | |||||||
| Spread over LIBOR | 1.25% | 1.60% | ||||||
| Mortgage loan, maturity date | October 2013 | |||||||
| Venture sale of real estate | 3,200,000 | |||||||
| Share of gain on sale of real estate | 1,100,000 | |||||||
| Gain on sale of property | 84,930,000 | 69,000 | ||||||
| Management, leasing and other services fees | $ 0 | $ 48,000 | $ 0 | $ 144,000 | ||||