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Shareholders' Equity - Conversion of Series E Convertible Units in Series D Convertible Units (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) shares | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) shares | Sep. 30, 2015 USD ($) | Feb. 29, 2016 shares | Dec. 31, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |
Conversion of convertible units | $ | $ 0 | $ 0 | $ 11,463 | $ 0 |  |
Series E Convertible Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Noncash charge related to contingent beneficial conversion on convertible units | $ |  |  | 2,800 |  |  |
Series D Convertible Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Noncash charge related to contingent beneficial conversion on convertible units | $ |  |  | $ 4,800 |  |  |
Series D Convertible Units | Operating Partnership |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Ownership units owned (in shares) | 8,750,000 |  | 8,750,000 |  |  |
AH LLC | Series E Convertible Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Ownership units owned (in shares) | 0 |  | 0 |  |  | 4,375,000
AH LLC | Series E Convertible Units | Operating Partnership |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Ownership units owned (in shares) |  |  |  |  | 4,375,000 |
Ownership units exchange ratio |  |  |  |  | 1 |
AH LLC | Series D Convertible Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Ownership units owned (in shares) | 0 |  | 0 |  |  | 4,375,000
AH LLC | Series D Convertible Units | Operating Partnership |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Ownership units owned (in shares) | 0 |  | 0 |  |  | 4,375,000

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