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Shareholders' Equity / Partners' Capital - Conversion of Series E Convertible Unit into Series D Convertible Units (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 USD ($) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |
Gain on conversion of Series E units | $ | $ 11,500 | $ 0 | $ 11,463 | $ 0
Series E Convertible Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Contingent beneficial conversion, Series E | $ | $ 2,800 |  |  |
Series E Convertible Units | Operating Partnership |  |  |  |
Class of Stock [Line Items] |  |  |  |
Units owned (in shares) | shares | 4,375,000 |  |  |
Series E Convertible Units | AH LLC | Operating Partnership |  |  |  |
Class of Stock [Line Items] |  |  |  |
Units owned (in shares) | shares | 4,375,000 |  |  |
Business acquisition, equity interest issued or issuable, number of shares, multiplier | 1 |  |  |

X
- Definition Business Acquisition, Equity Interest Issued or Issuable, Number of Shares, Multiplier + References No definition available. + Details
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- Definition Gain (Loss) on Conversion of Convertible Securities + References No definition available. + Details
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- Definition Noncash Charge Related to the Conversion of Units + References No definition available. + Details
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Balance Type: | debit
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- Definition The number of units of the operating partnership owned by the noncontrolling interest, a related party. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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