Organization, Formation and Structure (Details)	6 Months Ended
	Jun. 30, 2019 partnership store
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Distribution of REIT taxable income (excluding net capital gains) to its stockholders (percent)	90.00%
Number of partnerships | partnership	2
Number of shopping centers	32
Percentage of ownership in operating partnership	74.40%
Revenues
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of total revenue	2.50%
Giant Food
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of shopping centers	10
Percentage of total revenue	4.70%