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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 5, 2018, we acquired two development parcels totaling approximately nine acres in Nashville for an aggregate purchase price of $50.3 million. On February 6, 2018, the Company declared a cash dividend of $0.4625 per share of Common Stock, which is payable on March 6, 2018 to stockholders of record as of February 20, 2018.