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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 2, 2018, the Company completed the acquisition of Infomart Dallas, including its operations and tenants, from ASB Real Estate Investments. Refer to Note 4 for a discussion of this acquisition. On April 18, 2018, the Company acquired all of the equity interests in the Metronode group of companies from the Ontario Teachers' Pension Plan Board. Refer to Note 4 for a discussion of this acquisition. On May 2, 2018, the Company declared a quarterly cash dividend of $2.28 per share, which is payable on June 20, 2018 to the Company's common stockholders of record as of the close of business on May 23, 2018.