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Shareholders' Equity / Partners' Capital - Conversion of Series D Convertible Units into Class A Units (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) shares | Feb. 29, 2016 USD ($) shares | Dec. 31, 2017 $ / shares
Series D Convertible Units |  |  |
Class of Stock [Line Items] |  |  |
Percent of distributions claimed on operating partnership |  |  | 70.00%
Period after issuance for eligibility to participate in operating partnership distributions |  |  | 30 months
Limited liability company or limited partnership, conversion requirements, adjusted funds from operations (in dollars per share) | $ / shares |  |  | $ 0.80
Limited liability company or limited partnership, conversion requirements, average price per common share (in dollars per share) | $ / shares |  |  | $ 18.00
Contingent beneficial conversion, Series E | $ | $ 7.6 |  |
Series D Convertible Units | Operating Partnership |  |  |
Class of Stock [Line Items] |  |  |
Units owned (in shares) | 8,750,000 |  |
Series D Convertible Units | Operating Partnership | AH LLC |  |  |
Class of Stock [Line Items] |  |  |
Limited liability company or limited partnership, conversion ratio | 1 |  | 1
Series E Convertible Units |  |  |
Class of Stock [Line Items] |  |  |
Contingent beneficial conversion, Series E | $ |  | $ 2.8 |
Series E Convertible Units | Operating Partnership |  |  |
Class of Stock [Line Items] |  |  |
Units owned (in shares) |  | 4,375,000 |
Series E Convertible Units | Operating Partnership | AH LLC |  |  |
Class of Stock [Line Items] |  |  |
Units owned (in shares) |  | 4,375,000 |

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