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Gain on Sales of Real Estate	12 Months Ended
Gain on Sales of Real Estate	Dec. 31, 2018
Gain (Loss) on Sale of Investments [Abstract]
Gain on Sales of Real Estate	Gain on Sales of Real Estate During 2018, we sold 128 properties for $142.3 million, which resulted in a gain of $24.6 million. During 2017, we sold 59 properties for $167.0 million, which resulted in a gain of $40.9 million. During 2016, we sold 77 properties for $90.5 million, which resulted in a gain of $22.0 million. Additionally, during 2016 we sold our former corporate headquarters building for $8.6 million. These property sales do not represent a strategic shift that will have a major effect on our operations and financial results, and therefore do not require presentation as discontinued operations.