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Shareholders' Equity / Partners' Capital - Class B Common Shares (Details) - Class B common shares	12 Months Ended
	Dec. 31, 2018 Vote shares
Class of Stock [Line Items]
Common shares entitled to vote | Vote	50
Voting interest percent	30.00%
2012 Offering | AH LLC | 2,770 Property Contribution
Class of Stock [Line Items]
Common stock issued in connection with investment (in shares) | shares	635,075

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Number Of Votes Entitlement For Each Share Held.

+ References

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- Definition

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- Definition

Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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