Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (BNES Associates III) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (BNES Associates III) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
The Offices At Crystal Lake, L.L.C. [Member]
Oct. 23, 2012
BNES Associates III's Interest In The Offices At Crystal Lake [Member]
Oct. 23, 2012
BNES Associates III [Member]
sqft
Schedule of Equity Method Investments [Line Items]      
Indirect residual ownership percentage     31.25%
Area of property (in square feet)     106,345
Percentage of interest in venture     50.00%
Investment ownership percentage   62.50%  
Mortgage loans, carrying amount $ 7.2    
Interest rate 4.76%    
Mortgage loan, maturity date November 2023    
Holding and distribution pattern under operating agreement The operating agreement of Crystal Lake provides, among other things, for the distribution of net cash flow to the members in accordance with their percentage interests.