Disposals of Operating Properties and Impairment Charge	9 Months Ended
Disposals of Operating Properties and Impairment Charge	Sep. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]
Disposals of Operating Properties and Impairment Charge	Disposals of Operating Properties and Impairment Charge During the three months ended September 30, 2019, we sold eight operating properties for aggregate gross proceeds of $213.3 million and a net loss of $5.7 million. During the three months ended June 30, 2019, we sold eight operating properties for aggregate gross proceeds of $244.0 million and a net gain of $24.1 million. During the three months ended March 31, 2019, we sold our Whitehall Pike operating property in Bloomington, Indiana for aggregate gross proceeds of $13.5 million and a net gain of $6.6 million. As of September 30, 2019, in connection with the preparation and review of the financial statements required to be included in this Quarterly Report on Form 10-Q, we evaluated one operating property for impairment and recorded an $8.5 million impairment charge due to changes during the quarter in facts and circumstances underlying the Company's expected future hold period of the property. A shortening of an expected future hold period is considered an impairment indicator under applicable accounting rules, and this indicator caused us to further evaluate the carrying value of the property. We concluded the estimated undiscounted cash flows over the expected holding periods did not exceed the carrying value of the asset, leading to the charge during the quarter. We estimated the fair value of the property to be $12.6 million using the market approach by utilizing recent sales offers without adjustment. As of June 30, 2019, in connection with the preparation and review of the financial statements, we evaluated five operating properties for impairment and recorded impairment charges totaling $25.1 million due to changes during the quarter in facts and circumstances underlying the Company's expected future hold period of these properties. A shortening of an expected future hold period is considered an impairment indicator under applicable accounting rules, and this indicator caused us to further evaluate the carrying value of the property. We concluded the estimated undiscounted cash flows over the expected holding periods did not exceed the carrying value of each asset, leading to the charges during the quarter. We estimated the fair value of each property, which aggregated to $152.9 million, using the market approach by utilizing recent sales offers without adjustment. Two of these operating properties were sold in July 2019, one was sold in August 2019, and one was sold in October 2019. As of March 31, 2019, in connection with the preparation and review of the financial statements, we evaluated an operating property for impairment and recorded a $4.1 million impairment charge due to changes in our estimate of the fair value for a property in which we had previously concluded that undiscounted cash flows were insufficient to recover the carrying value. We estimated the fair value of the property to be $10.0 million using the market approach by utilizing a recent sales offer without adjustment. We compared the estimated fair value to the carrying value, which resulted in the recording of a non-cash impairment charge of $4.1 million for the three months ended March 31, 2019. This property was sold in May 2019. During the three months ended June 30, 2018, we contributed our Livingston Shopping Center, Plaza Volente, and Tamiami Crossing operating properties to a joint venture for an agreed upon value of $99.8 million in exchange for a 20% ownership interest and $89.0 million in net proceeds from the transaction that resulted in a net gain of $7.8 million. The Company calculated the gain in accordance with ASC 606 and ASC 610-20 that require full gain recognition upon deconsolidation of a nonfinancial asset. This gain was calculated as the fair value of the properties (based upon the sales price for the 80% of interests) less the aggregate carrying value. The retained 20% equity method investment was recorded at fair value as of the transaction date of June 29, 2018, or $10.0 million. Our share of income from this investment was not material to the period ended June 30, 2018. As of June 30, 2018, in connection with the preparation and review of the financial statements, we evaluated two properties for impairment and recorded a $14.8 million impairment charge due to changes during the quarter in facts and circumstances underlying the Company's expected future hold period of these properties. We concluded the estimated undiscounted cash flows over the expected holding period did not exceed the carrying value of these assets, leading to the charge during the quarter. We estimated the fair value using the market approach by utilizing recent sales offers without adjustment. We compared the estimated aggregate fair value of $30.4 million to the carrying values, which resulted in the recording of a non-cash impairment charge of $14.8 million for the three months ended June 30, 2018. During the three months ended March 31, 2018, we sold our Trussville Promenade operating property in Birmingham, Alabama, and our Memorial Commons operating property in Goldsboro, North Carolina, for aggregate gross proceeds of $63.0 million and a net gain of $0.5 million. As of March 31, 2018, in connection with the preparation and review of the financial statements, we evaluated an operating property for impairment and recorded a $24.1 million impairment charge due to changes during the quarter in facts and circumstances underlying the Company’s expected future hold period of this property. A shortening of an expected future hold period is considered an impairment indicator under applicable accounting rules, and this indicator caused us to further evaluate the carrying value of this property. We concluded the estimated undiscounted cash flows over the expected holding period did not exceed the carrying value of a certain asset, leading to the charge during the quarter. We estimated the fair value of the property to be $24.3 million using the market approach by utilizing recent sales offer without adjustment. We compared the estimated fair value to the carrying value, which resulted in the recording of a non-cash impairment charge of $24.1 million for the three months ended March 31, 2018. This property was sold in June 2018.