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Real Estate Investments (Details Textual)
$ in Thousands, ft² in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2014
USD ($)
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
Real Estate Properties [Line Items]        
Deferred Revenue   $ 1,837 $ 1,823  
Operating Leases, Rent Expense   653 653 $ 606
Proceeds from Sale of Real Estate   44,300 27,900 28,100
Gains (Losses) on Sales of Investment Real Estate   $ 14,200 $ 10,000 $ 12,100
Number of Real Estate Properties   436 366  
Land Subject to Ground Leases | ft²   8.7 7.0  
Real Estate Investment Property, Net, Total   $ 1,214,016 $ 950,261  
Five Development And PCS Projects [Member]        
Real Estate Properties [Line Items]        
Property Subject to or Available for Operating Lease, Gross   41,300    
Nine Development And PCS Projects [Member]        
Real Estate Properties [Line Items]        
Property Subject to or Available for Operating Lease, Gross   62,700    
Eighty Two Retail Net Lease Assets [Member]        
Real Estate Properties [Line Items]        
Payments to Acquire Property, Plant, and Equipment     $ 295,600  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year)     10 years 8 months 12 days  
Percentage Of Control Of Assets (in Percentage)     100.00%  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land     $ 84,300  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings     170,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 41,300  
Seventy Nine Retail Net Lease Assets [Member]        
Real Estate Properties [Line Items]        
Payments to Acquire Property, Plant, and Equipment   $ 338,000    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year)   11 years 1 month 6 days    
Percentage Of Control Of Assets (in Percentage)   100.00%    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land   $ 94,100    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings   172,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   71,900    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt   $ 21,500    
Corporate Joint Venture [Member]        
Real Estate Properties [Line Items]        
Deferred Revenue, Additions $ 4,000      
Deferred Revenue 4,000      
Deferred Revenue, Refund Payments $ 4,000      
Operating Leases, Future Minimum Payments Receivable [Member]        
Real Estate Properties [Line Items]        
Concentration Risk, Percentage   6.50%