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Debt (Mortgage Notes Payable) (Narrative) (Details) - Mortgage Notes Payable [Member]
$ in Millions
6 Months Ended
Mar. 06, 2015
USD ($)
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Loan default $ 38.1 $ 35.6   $ 53.8
Gain (loss) on forgiveness of debt     $ 4.9  
Default rate of interest, per annum 10.68%      
Number of real estate properties foreclosed | property   1    
Loan default, number of properties that secure the loan | property   2    
Reduction/elimination of debt   $ 56.4    
Gain (Loss) on the Disposition of Real Estate, Net [Member]        
Debt Instrument [Line Items]        
Gain (loss) on forgiveness of debt   (3.4)    
Reduction/elimination of debt   $ 2.5