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Real Estate-Related Notes Receivables (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
receivables
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
receivables
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Real Estate-Related Notes Receivables [Line Items]          
Number of real estate-related notes receivables | receivables 2   2    
Real estate-related notes receivables interest income $ 216,000 $ 1,280,000 $ 355,000 $ 2,431,000  
Impairment loss recorded on real estate-related notes receivables 0 $ 0 0 $ 0  
Allowance for uncollectability recorded on real estate-related notes receivables $ 0   $ 0   $ 0
Minimum [Member]          
Real Estate-Related Notes Receivables [Line Items]          
Per annum interest rate (as a percent)     8.00%    
Maximum [Member]          
Real Estate-Related Notes Receivables [Line Items]          
Per annum interest rate (as a percent)     12.00%    
Weighted Average [Member]          
Real Estate-Related Notes Receivables [Line Items]          
Per annum interest rate (as a percent)     8.20%