Annual report pursuant to Section 13 and 15(d)

Real Estate Transactions (Property Sales) (Narrative) (Details)

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Real Estate Transactions (Property Sales) (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2013
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Dec. 31, 2012
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Feb. 24, 2014
Keystone Portfolio [Member]
Scenario, Forecast [Member]
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Real Estate Properties [Line Items]      
Number of properties sold 24 4 15
Area of property sold (in square feet) 3,006,409 269,958 2,300,000
Sale price of property     $ 230,800,000
Sales proceeds 390,615,000 [1] 23,405,000 201,700,000
Capital balance     22,200,000
Number of properties with senior pari passu interest     3
Capital balance in proeperties in which senior pari passu interest is held     $ 6,900,000
Senior pari passu equity internal rate of return     15.00%
Subordinated equity internal rate of return     10.00%
Number of agreement extensions     2
Agreement extension period     30 days
Number of properties with first offer rights     11
[1] This amount excludes approximately $535,000 of net closing prorations and related adjustments received from sellers at closing.