Impairments	3 Months Ended
Mar. 31, 2018
Impairments
Impairments	13.Impairments We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. A provision is made for impairment if estimated future operating cash flows (undiscounted and without interest charges) plus estimated disposition proceeds (undiscounted) are less than the current book value of the property. Key factors that we utilize in this analysis include projected rental rates, estimated holding periods, historical sales and releases, capital expenditures and property sales capitalization rates. If a property is classified as held for sale, it is carried at the lower of carrying cost or estimated fair value, less estimated cost to sell, and depreciation of the property ceases. For the first three months of 2018, we recorded total provisions for impairment of $14.2 million on five properties classified as held for sale, one property classified as held for investment, and four sold properties. For the first three months of 2017, we recorded total provisions for impairment of $5.4 million on one property classified as held for sale, three properties classified as held for investment, and five sold properties.

13.Impairments

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. A provision is made for impairment if estimated future operating cash flows (undiscounted and without interest charges) plus estimated disposition proceeds (undiscounted) are less than the current book value of the property. Key factors that we utilize in this analysis include projected rental rates, estimated holding periods, historical sales and releases, capital expenditures and property sales capitalization rates. If a property is classified as held for sale, it is carried at the lower of carrying cost or estimated fair value, less estimated cost to sell, and depreciation of the property ceases.

For the first three months of 2018, we recorded total provisions for impairment of $14.2 million on five properties classified as held for sale, one property classified as held for investment, and four sold properties. For the first three months of 2017, we recorded total provisions for impairment of $5.4 million on one property classified as held for sale, three properties classified as held for investment, and five sold properties.