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Real Estate Investments (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2004
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]        
Deferred Revenue   $ 1,823 $ 1,708  
Operating Leases, Rent Expense   653 606 $ 471
Impairment of Real Estate   0 0 3,020
Proceeds from Sale of Real Estate   29,700 29,000 12,900
Gains (Losses) on Sales of Investment Real Estate   $ 10,000 12,100 400
Real Estate Portfolio Leased Intangible Assets Percentage   99.60%    
Real Estate Portfolio Leased Intangible Assets Weighted Average Remaining Lease Term   10 years 7 months 6 days    
Four Development And PCS Projects [Member]        
Real Estate Properties [Line Items]        
Property Subject to or Available for Operating Lease, Gross   $ 21,700    
Fourteen Development And PCS Projects [Member]        
Real Estate Properties [Line Items]        
Property Subject to or Available for Operating Lease, Gross   38,000    
Corporate Joint Venture [Member]        
Real Estate Properties [Line Items]        
Deferred Revenue, Additions $ 4,000      
Deferred Revenue 4,000      
Deferred Revenue, Refund Payments $ 4,000      
Petoskey Town Center [Member]        
Real Estate Properties [Line Items]        
Impairment of Real Estate       200
Chippewa Commons [Member]        
Real Estate Properties [Line Items]        
Impairment of Real Estate       $ 2,800
Seventy Three Retail Net Lease Assets [Member]        
Real Estate Properties [Line Items]        
Payments to Acquire Property, Plant, and Equipment     $ 220,600  
Weighted Average Capitalization Rate For Acquired Assets (In Percentage)     8.00%  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year)     12 years 2 months 12 days  
Percentage Of Control Of Assets (in Percentage)     100.00%  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land     $ 33,800  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings     152,800  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 34,000  
Eighty Two Retail Net Lease Assets [Member]        
Real Estate Properties [Line Items]        
Payments to Acquire Property, Plant, and Equipment   $ 295,600    
Weighted Average Capitalization Rate For Acquired Assets (In Percentage)   7.80%    
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    
Operating Leases, Future Minimum Payments Receivable [Member] | Walgreens [Member]        
Real Estate Properties [Line Items]        
Concentration Risk, Percentage   11.60%