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Shareholders' Equity - Conversion of Series D Convertible Units into Class A Units (Details) - Series D Convertible Units $ / shares in Units, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2015 shares
Class of Stock [Line Items] |  |
Percentage of distributions claimed on operating partnership units | 70.00% |
Period after issuance for eligibility to participate in operating partnership distributions | 30 months |
Conversion requirements, adjusted funds from operations per share (in USD per share) | $ / shares | $ 0.80 |
Conversion requirements, average price per common share (in USD per share) | $ / shares | $ 18.00 |
Noncash charge related to contingent beneficial conversion on convertible units | $ | $ 4.8 |
AH LLC |  |
Class of Stock [Line Items] |  |
Ownership units owned (in shares) | 0 | 4,375,000
Operating Partnership |  |
Class of Stock [Line Items] |  |
Ownership units owned (in shares) | 8,750,000 |
Operating Partnership | AH LLC |  |
Class of Stock [Line Items] |  |
Conversion ratio of convertible units | 1 |
Ownership units owned (in shares) | 0 | 4,375,000

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