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Shareholders' Equity / Partners' Capital - Class B Common Shares (Details) - Class B common shares | 12 Months Ended
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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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