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Stock-based Compensation - Restricted Share Units (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash share compensation       $ 4,619 $ 3,238
2013 Plan | Restricted share units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of dividend equivalent included in each award 1        
Non-cash share compensation   $ 1,200 $ 1,000 3,100 $ 1,700
Unrecognized compensation expense   $ 7,600   $ 7,600  
2013 Plan | Performance based restricted stock units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in dollars per share) $ 16.58        
Performance conditions grant date fair value (in dollars per share) $ 14.78        
Officers and Certain Employees | 2013 Plan | Restricted share units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 254,282        
Vesting period 3 years        
Officers and Certain Employees | 2013 Plan | Market Based Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 40.00%        
Granted (in dollars per share) $ 19.28        
Officers and Certain Employees | 2013 Plan | Performance based restricted stock units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 60.00%        
Trustees | 2013 Plan | Restricted share units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 50,745        
Vesting period 2 years        
Trustees | 2013 Plan | Performance based restricted stock units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of restricted share units issued to trustees 100.00%