Nature of Business and Financial Statement Presentation (Narrative) (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($) ft² Property
Nture of Oerations and Financial Statements Presentation [Line Items]
Gross leasable area \| ft²	444,779
Transaction costs capitalized \| $	$ 0.4
Shopping Center
Nture of Oerations and Financial Statements Presentation [Line Items]
Number of real estate properties \| Property	498
Gross leasable area \| ft²	84,000,000
Land Parcel
Nture of Oerations and Financial Statements Presentation [Line Items]
Number of real estate properties held through an unconsolidated joint venture \| Property	1
Parent Company \| BPG Sub
Nture of Oerations and Financial Statements Presentation [Line Items]
Ownership percentage	100.00%

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- Definition

[Line Items] for Nture of Oerations and Financial Statements Presentation [Table]

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Number of Real Estate Properties Held through an Unconsolidated Joint Venture

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- Definition

The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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The number of real estate properties owned as of the balance sheet date.

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