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Acquisitions and Dispositions Acquisitions and Dispositions - Management Internalization (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Jun. 10, 2013
Dec. 31, 2014
Dec. 31, 2015
Nov. 30, 2012
Business Acquisition [Line Items]        
Issuance of Class A units   $ 11,179    
Estimated fair values of the net assets        
Goodwill   $ 120,655 $ 120,655  
Management Internalization        
Business Acquisition [Line Items]        
Acquired of membership interests 100.00%      
Monthly maintenance fee $ 100      
Estimated fair values of the net assets        
Buildings and improvements 4,214      
Goodwill 120,655      
Estimated fair value of assets and liabilities acquired 130,069      
Net monetary assets of subsidiary 7,000      
Cash and cash equivalents 9,000      
Trademark | Management Internalization        
Estimated fair values of the net assets        
Identified intangible assets 3,100      
Database | Management Internalization        
Estimated fair values of the net assets        
Identified intangible assets $ 2,100      
Series D Convertible Units | Operating Partnership        
Business Acquisition [Line Items]        
Issuance of units (in shares) 4,375,000      
Series E Convertible Units | Operating Partnership        
Business Acquisition [Line Items]        
Units owned (in shares)   4,375,000    
AH LLC | Series D Convertible Units        
Business Acquisition [Line Items]        
Units owned (in shares)   4,375,000 4,375,000  
AH LLC | Series D Convertible Units | Operating Partnership        
Business Acquisition [Line Items]        
Units owned (in shares)   4,375,000 4,375,000  
AH LLC | Series D Convertible Units | Operating Partnership | Management Internalization        
Business Acquisition [Line Items]        
Issuance of Class A units $ 65,200      
AH LLC | Series E Convertible Units        
Business Acquisition [Line Items]        
Units owned (in shares)   4,375,000 4,375,000  
AH LLC | Series E Convertible Units | Operating Partnership        
Business Acquisition [Line Items]        
Units owned (in shares) 4,375,000 4,375,000    
AH LLC | Series E Convertible Units | Operating Partnership | Management Internalization        
Business Acquisition [Line Items]        
Issuance of Class A units $ 64,900      
Minimum | Management Internalization        
Business Acquisition [Line Items]        
Right to receive percentage of promoted interests in future outside investment vehicles 20.00%      
Maximum | Management Internalization        
Business Acquisition [Line Items]        
Right to receive percentage of promoted interests in future outside investment vehicles 100.00%      
Agreement on Investment Opportunities | AH LLC        
Business Acquisition [Line Items]        
Acquisition and renovation fee in percent 5.00%     5.00%