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Nature of Business and Financial Statement Presentation (Narrative) (Details)
ft² in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
ft²
Property
Mar. 31, 2018
USD ($)
Nture of Oerations and Financial Statements Presentation [Line Items]    
Capitalized indirect internal leasing overhead costs $ 2.0  
Accounting Standards Update 2016-02    
Nture of Oerations and Financial Statements Presentation [Line Items]    
Capitalized indirect internal leasing overhead costs   $ 3.0
Shopping Center    
Nture of Oerations and Financial Statements Presentation [Line Items]    
Number of real estate properties | Property 422  
GLA | ft² 73  
Parent Company | BPG Sub    
Nture of Oerations and Financial Statements Presentation [Line Items]    
Ownership percentage 100.00%