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Stock-based Compensation - Restricted Share Units Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of restricted share units issued to trustees   100.00%    
Non-cash share compensation   $ (941) $ 1,185  
2013 Plan | Restricted share units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-cash share compensation   700 $ 400  
Unrecognized compensation expense   $ 8,000    
2013 Plan | Trustee Awards, Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)   32,831    
Granted (in dollars per share)   $ 19.80    
2013 Plan | Performance based restricted stock units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in dollars per share)   $ 29.34    
Vesting percentage   30.00%    
Performance conditions grant date fair value (in dollars per share)   $ 19.80    
Directors | 2013 Plan | Restricted share units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   2 years    
Number of dividend equivalent included in each award       1
Officers | 2013 Plan | Restricted share units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 174,320      
Vesting period   3 years    
Officers | 2013 Plan | Market Based Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in dollars per share) $ 33.43      
Vesting percentage 70.00%