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Contributions by AH LLC | 12 Months Ended
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Dec. 31, 2016
Noncash Investing and Financing Items [Abstract] |
Contributions by AH LLC | Contributions by AH LLC 45 Property Acquisition On December 12, 2014, we and our operating partnership entered into a contribution agreement with AH LLC, pursuant to which AH LLC contributed to our operating partnership all of AH LLC's interest in 45 properties owned by AH LLC. The value of the properties was determined by broker price opinions prepared by independent third parties. In exchange for the properties, our operating partnership issued to AH LLC 653,378 Class A units valued at $17.11 per unit, the closing price on the NYSE for the Company's Class A common shares on December 11, 2014. The Class A units owned by AH LLC were distributed to its individual members when AH LLC was liquidated in August 2016.

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