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Subsequent Events Subsequent Events	3 Months Ended
Subsequent Events Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On July 2, 2018, the Company closed on the disposition of a 6.5 acre land parcel located in the Atlanta, Georgia market, for proceeds of $1.8 million, resulting in an expected net gain of $1.0 million on the sale of non-depreciable real estate assets. This land parcel was classified as held for sale as of June 30, 2018 as described in Note 1. On July 30, 2018, the Company retired a $50.0 million tranche of senior unsecured private placement notes at maturity. On August, 1, 2018, the Company retired a $250.0 million unsecured term loan with Wells Fargo at maturity.