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Impairment Charges	12 Months Ended
Impairment Charges	Dec. 31, 2018
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 did not record any impairment charges in 2018. The Company recorded impairment charges on properties sold or classified as held for sale for the years ended December 31, 2017 and 2016 totaling $5.4 million and $0.1 million, respectively. Both level 1 and level 3 fair value techniques were used to derive these impairment charges.