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Gain on Sales of Real Estate	9 Months Ended
Gain on Sales of Real Estate	Sep. 30, 2018
Gain (Loss) on Sale of Investments [Abstract]
Gain on Sales of Real Estate	Gain on Sales of Real Estate During the third quarter of 2018, we sold 20 properties for $35.5 million, which resulted in a gain of $7.8 million. During the third quarter of 2017, we sold 17 properties for $25.5 million, which resulted in a gain of $4.3 million. During the first nine months of 2018, we sold 60 properties for $83.0 million, which resulted in a gain of $18.8 million. During the first nine months of 2017, we sold 46 properties for $69.5 million, which resulted in a gain of $17.7 million.