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Acquired Properties - Estimated Fair Value of Retail Properties Acquired and Liabilities Assumed (Details) - 2019 Acquisitions $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Schedule of Asset Acquisition [Line Items]
Investment property additions	$ 79,574
Intangible assets	8,504
Intangible liabilities	(2,091)
Net other assets and liabilities	763
Total fair value of assets acquired and liabilities assumed	86,750
Land
Schedule of Asset Acquisition [Line Items]
Investment property additions	19,902
Building and other improvements
Schedule of Asset Acquisition [Line Items]
Investment property additions	$ 59,672

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[Line Items] for Schedule of Asset Acquisition [Table]

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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