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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Concurrently with the Company's public offering of Class A common shares in the first quarter of 2017, the Chairman of our Board of Trustees, B. Wayne Hughes, purchased $50.0 million of our Class A common shares in a private placement at the public offering price. The Operating Partnership issued an equivalent number of corresponding Class A units to AH4R in exchange for the net proceeds from the issuance.