Equity and Capital - Common Stock (Details) - USD ($)			9 Months Ended
	Feb. 04, 2020	Jan. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Common stock remaining available for Issuance			500,000,000
Common stock, shares issued			169,677,302		167,571,218
Net proceeds from common stock issuance			$ 125,608,000
Stock Repurchase Program, Authorized Amount	$ 250,000,000
Stock Repurchase Program Expiration Date	Feb. 05, 2021
Stock Repurchased and Retired During Period, Value				$ (32,777,000)
Common Stock [Member] | Shopping Center [Member]
Class of Stock [Line Items]
Issuance of exchangeable operating partnership, units		18,613
Issuance of operating partnership, value		$ 1,300,000
Acquisition of additional interest		16.62%
Common Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value			$ 0
Equity Offering Program [Member]
Class of Stock [Line Items]
Shares issued under program			0
Forward Equity Offering [Member] | Equity Offering Program [Member]
Class of Stock [Line Items]
Common stock, shares issued			1,894,845
Net proceeds from common stock issuance			$ 125,800,000
Maximum [Member]
Class of Stock [Line Items]
Equity Issuances, Common Shares Authorized for Issuance			500,000,000