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Stock-based Compensation - Restricted Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Aug. 07, 2014
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Jul. 24, 2013
Stock-based compensation          
Grant date value     $ 2,500    
Shares          
Vested (in shares)     (20,481)    
Weighted Average Grant Date Fair Value          
Vested (in dollars per share)     $ 15.87    
Non-cash share compensation     $ 1,185 $ 867  
2013 Plan | Restricted common shares          
Stock-based compensation          
Maximum number of shares authorized 2,450,000       600,000
Increase in number of common shares authorized for issuance 1,850,000        
Shares          
Non-vested at the beginning of the period (in shares)     311,839    
Granted (in shares)     141,381    
Vested (in shares)     (81,535)    
Forfeited (in shares)     326    
Non-vested at the beginning of the period (in shares)   371,359 371,359    
Weighted Average Grant Date Fair Value          
Non-vested at beginning of period (in dollars per share)     $ 14.17    
Granted (in dollars per share)     17.66    
Vested (in dollars per share)     15.98    
Forfeited (in dollars per share)     15.36    
Non-vested at beginning of period (in dollars per share)   $ 15.10 $ 15.10    
Non-cash share compensation     $ 900 700  
Unrecognized compensation expense   $ 3,700 $ 3,700    
Initial estimated cumulative forfeiture rate (as a percent)     0.00%    
2013 Plan | Restricted common shares | Officers          
Stock-based compensation          
Vesting period     1 year    
2013 Plan | Restricted common shares | Trust employees          
Stock-based compensation          
Vesting period     3 years    
2013 Plan | Restricted Share Units (RSUs)          
Shares          
Non-vested at the beginning of the period (in shares)     171,886    
Granted (in shares)   141,337 141,337    
Non-vested at the beginning of the period (in shares)   292,742 292,742    
Weighted Average Grant Date Fair Value          
Non-vested at beginning of period (in dollars per share)     $ 18.48    
Granted (in dollars per share)     24.08    
Non-vested at beginning of period (in dollars per share)   $ 21.37 $ 21.37    
Non-cash share compensation     $ 400 $ 100  
Unrecognized compensation expense   $ 4,700 $ 4,700    
2013 Plan | Restricted Share Units (RSUs) | Officers          
Stock-based compensation          
Vesting period     3 years    
2013 Plan | Restricted Share Units (RSUs) | Directors          
Stock-based compensation          
Vesting period     2 years