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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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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 55



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