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- (Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
property
Mar. 31, 2016
USD ($)
Mar. 29, 2017
USD ($)
Dec. 31, 2016
USD ($)
property
Schedule of Investments [Line Items]        
Held-to-maturity securities, unrecognized holding loss $ 0 $ 0    
Number of real estate properties classified as held-for-sale | property 358     391
Inventory, held-for-sale, properties | property 219      
Investments in debt securities, net $ 209,386,000     $ 209,337,000
Held-to-maturity securities, unrecognized holding gain 0 0    
Other than temporary impairment recognized in other comprehensive income 0 $ 0    
Real estate held-for-sale 18,520,000      
Real estate held-for-sale, sales price     $ 21,778,000  
Allowance for doubtful accounts receivable 1,198,000     1,183,000
Debt issuance costs, line of credit arrangements incurred 9,634,000      
Residential Mortgage Backed Securities | Class G Certificates        
Schedule of Investments [Line Items]        
Investments in debt securities, net $ 193,045,000      
Marketable securities, expected maturity term 12 months      
Residential Mortgage Backed Securities | Class F Certificates        
Schedule of Investments [Line Items]        
Investments in debt securities, net       16,423,000
Marketable securities, unamortized discount $ 82,000     $ 131,000
Marketable securities, expected maturity term 3 months      
Minimum        
Schedule of Investments [Line Items]        
Lessor leasing arrangements, operating leases, term of contract 12 months