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Acquisition of Real Estate (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
land_parcel
Sep. 30, 2015
USD ($)
land_parcel
Sep. 30, 2014
USD ($)
land_parcel
Real Estate Properties [Line Items]      
Net purchase price   $ 59,208  
Other Nonoperating Income (Expense) [Member]      
Real Estate Properties [Line Items]      
Acquisition related expenses   $ 1,600  
Acquired Outparcels [Member]      
Real Estate Properties [Line Items]      
Number of outparcels acquired | land_parcel 2 4 3
Net purchase price $ 6,500 $ 8,600 $ 12,300