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Shareholders' Equity (Details 3) - 2012 Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended 36 Months Ended
Jun. 10, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Apr. 30, 2013
Board of Trustees              
Class of Stock              
Vesting period   4 years          
Expiration period           10 years  
Stock options              
Stock Options              
Outstanding at beginning of the period (in shares)   2,165,000 1,190,000 700,000      
Granted (in shares)   588,500 1,270,000 550,000      
Exercised (in shares)   (16,600) (28,750) 0      
Forfeited (in shares)   (252,500) (266,250) (60,000)      
Outstanding at end of the period (in shares)   2,484,400 2,165,000 1,190,000 700,000 2,165,000  
Exercisable at end of the period (in shares)   860,900          
Weighted Average Exercise Price              
Outstanding at beginning of the period (in dollars per share)   $ 16.17 $ 15.48 $ 15.00      
Granted (in dollars per share)   16.49 16.74 16.03      
Exercised (in dollars per share)   15.16 15.00 0.00      
Forfeited (in dollars per share)   16.57 15.88 15.00      
Outstanding at end of the period (in dollars per share)   16.22 $ 16.17 $ 15.48 $ 15.00 $ 16.17  
Exercisable at end of the period (in dollars per share)   $ 15.81          
Aggregate intrinsic value              
Weighted average remaining life   8 years 7 days 8 years 9 months 18 days 9 years 3 months 18 days 9 years 10 months 24 days    
Weighted average exercisable   7 years 4 months 24 days          
Aggregate intrinsic value   $ 1,225 $ 1,890 $ 862 $ 0 $ 1,890  
Aggregate intrinsic value exercised   19 $ 74 $ 0      
Aggregate intrinsic value exercisable   $ 766          
Restricted stock units              
Class of Stock              
Stock options granted (in shares)   44,000 92,000        
Class A common shares              
Class of Stock              
Shares available for issuance         1,500,000   6,000,000
Class A common shares | Stock options              
Class of Stock              
Stock options granted (in shares)   588,500 1,270,000 550,000      
Class A common shares | Stock options | AH LLC              
Class of Stock              
Options reclassified as grants to employees (in shares) 485,000