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Shareholders' Equity (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Class of Stock |  |  |  |  |
Income (loss) allocated to noncontrolling interest | $ 3,730 | $ 4,212 | $ 7,686 | $ 7,832 |
AH LLC |  |  |  |  |
Class of Stock |  |  |  |  |
Percentage of units outstanding | 21.80% |  | 21.80% |  | 21.80%
Operating Partnership | Class A Units |  |  |  |  |
Class of Stock |  |  |  |  |
Units outstanding (in shares) | 225,927,834 |  | 225,927,834 |  | 225,914,576
Income (loss) allocated to noncontrolling interest | $ 800 | 600 | $ 1,600 | 1,300 |
Operating Partnership | Class A Units | AH LLC |  |  |  |  |
Class of Stock |  |  |  |  |
Percentage of units outstanding | 6.40% |  | 6.40% |  | 6.40%
Units owned (in shares) | 14,440,670 |  | 14,440,670 |  | 14,440,670
Operating Partnership | Series C Convertible Units |  |  |  |  |
Class of Stock |  |  |  |  |
Income (loss) allocated to noncontrolling interest | $ 4,700 | 4,700 | $ 9,400 | 9,200 |
Operating Partnership | Series C Convertible Units | AH LLC |  |  |  |  |
Class of Stock |  |  |  |  |
Units owned (in shares) | 31,085,974 |  | 31,085,974 |  | 31,085,974
Operating Partnership | Series D Convertible Units | AH LLC |  |  |  |  |
Class of Stock |  |  |  |  |
Units owned (in shares) | 4,375,000 |  | 4,375,000 |  | 4,375,000
Certain consolidated subsidiaries with noncontrolling interest |  |  |  |  |
Class of Stock |  |  |  |  |
Income (loss) allocated to noncontrolling interest | $ (200) | $ 100 | $ (100) | $ (100) |

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