Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Real Estate Impairment (Details)

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Real Estate Investments - Real Estate Impairment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate Properties [Line Items]          
Impairment of Real Estate $ 2,097 $ 14,526 $ 0 $ 0 $ 14,526
Real Estate Investment Property, Net 1,553,596   1,598,200 1,553,596  
Real estate impairment, including amounts in discontinued operations   599 0 2,097 15,125
4661 Kenmore Avenue [Member]
         
Real Estate Properties [Line Items]          
Real Estate Investment Property, Net     $ 3,800