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Equity and Capital Equity and Capital - Common Stock (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 04, 2020 | Jan. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Common stock remaining available for Issuance |  |  |  | 500,000,000 |  |
Common stock, shares issued |  |  |  | 169,664,850 |  | 167,571,218
Net proceeds from common stock issuance |  |  |  | $ 125,616,000 | $ 0 |
Stock Repurchase Program, Authorized Amount | $ 250,000,000 |  |  |  |  |
Stock Repurchase Program Expiration Date | Feb. 05, 2021 |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 0 |  | $ (32,778,000) |
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 | 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 |  |

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