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Noncash Transactions	12 Months Ended
	Dec. 31, 2018
Nonmonetary Transactions [Abstract]
Noncash Transactions	Noncash Transactions On February 29, 2016, the Company completed the ARPI Merger in a stock-for-stock transaction. Each holder of ARPI common stock received 1.135 of the Company's Class A common shares for each share of ARPI common stock and each holder of limited partnership interests in ARPI's operating partnership received 1.135 Class A units of the Operating Partnership. The Company issued 36,546,170 Class A common shares in connection with the ARPI Merger, for which the Operating Partnership issued an equivalent number of corresponding Class A units to AH4R in exchange for the transaction consideration. Additionally, the Operating Partnership issued 1,343,843 Class A units to certain former ARPI employees in connection with the ARPI Merger. The total Class A units issued in connection with the ARPI Merger represented 12.7% of the total common units of the Operating Partnership, on a fully diluted basis assuming the conversion of convertible units into common units, as of the acquisition date (see Note 11).

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- Definition

The entire disclosure for exchanges with other entities that involve principally nonmonetary assets or liabilities or relate to a transfer of nonmonetary assets for which the entity receives no assets in return.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 845
-URI http://asc.fasb.org/topic&trid=2127423

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