Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Capitol Place Mezz LLC) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Capitol Place Mezz LLC) (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 23, 2013
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated joint ventures $ 179,656,000 $ 181,129,000  
Capitol Place Mezz LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest in venture     50.00%
Investments in unconsolidated joint ventures 47,302,000 46,628,000 46,500,000
Holding and distribution pattern under operating agreement In general, the operating agreement of Capitol provides that net cash flows from a capital event are distributed first, to each holder of a member loan, as defined, until all member loans have been paid in full; second, to FB until FB has received the aggregate amount of $2,500,000; and third, to the members in accordance with their percentage interests. The operating agreement also includes specific provisions, including a right of first offer on all development deals in the D.C. metro area that involve either party, with specific qualifications on any properties in Arlington County, Virginia.    
Capitol Place Mezz LLC [Member] | FB Capitol Place LLC [Member]
      
Schedule of Equity Method Investments [Line Items]      
Threshold of member unreturned capital for distribution of capital event flows 2,500,000    
WDC Project [Member]
      
Schedule of Equity Method Investments [Line Items]      
Number of units     377
Area of property (in square feet)     25,000
Number of parking spaces     309
Total project costs 120,700,000    
Costs of the project incurred 46,800,000    
Mortgage loan, maturity period 30 years    
WDC Project [Member] | Construction Loan [Member]
      
Schedule of Equity Method Investments [Line Items]      
Mortgage loan, maturity period 20 years    
Maximum borrowing capacity 100,700,000    
Amount outstanding $ 36,000,000    
Interest rate 4.82%    
Loan maturity date Jul. 01, 2033