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Shareholders' Equity (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Class of Stock
Income (loss) allocated to noncontrolling interest	$ 3,109	$ 3,382	$ 10,795	$ 11,214
AH LLC
Class of Stock
Percentage of units outstanding	22.10%		22.10%		21.80%
Operating Partnership | Class A Units
Class of Stock
Units outstanding (in shares)	222,536,211		222,536,211		225,914,576
Income (loss) allocated to noncontrolling interest	$ 1,600	1,100	$ 3,200	2,500
Operating Partnership | Class A Units | AH LLC
Class of Stock
Units owned (in shares)	14,440,670		14,440,670		14,440,670
Percentage of units outstanding	6.50%		6.50%		6.40%
Operating Partnership | Series C Convertible Units
Class of Stock
Income (loss) allocated to noncontrolling interest	$ 4,700	4,700	$ 14,100	13,900
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	$ 10	$ 200	$ 60	$ 200

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



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-SubTopic 10



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