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ACQUISITIONS - Schedule of Pro Forma Information (Details) - Retail Properties of America, Inc. - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Rental income | $ 740,954,000 | $ 683,093,000
Net income (loss) | 21,283,000 | (109,775,000)
Net income (loss) attributable to common shareholders | $ 20,535,000 | $ (107,341,000)
Net income (loss) attributable to common shareholders per common share, basic (in USD per share) | $ 0.09 | $ (0.49)
Net income (loss) attributable to common shareholders per common share, diluted (in USD per share) | $ 0.09 | $ (0.49)
Merger costs | $ 86,500 |

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