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Impairment Charges	12 Months Ended
Impairment Charges	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Impairment Charges	Impairment Charges An asset is impaired when undiscounted cash flows expected to be generated by the asset are less than the carrying value of the asset. The Company must assess the potential for impairment of its long-lived assets, including real estate properties, whenever events occur or there is a change in circumstances, such as the sale of a property or the decision to sell a property, that indicate that the recorded value might not be fully recoverable. The Company recorded impairment charges on properties sold or classified as held for sale, included in discontinued operations, for the years ended December 31, 2016 and 2015 totaling $0.1 million and $0.7 million, respectively. The Company recorded impairment charges on two properties sold in 2017 and two properties sold in 2015, included in continuing operations, for the years ended December 31, 2017 and 2015 totaling $5.4 million and $3.6 million, respectively. Both level 1 and level 3 fair value techniques were used to derive these impairment charges.