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Share-Based Compensation - Restricted Stock Grants (Details) - Restricted Stock Units - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Trustee group        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     12,285 373,438
Vesting Period     1 year  
Grant Date Fair Value (in thousands)     $ 375 $ 5,975
Employee group        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares) 35,042 58,625 490,546 955,751
Grant Date Fair Value (in thousands) $ 1,163 $ 1,004 $ 16,332 $ 14,071
Minimum | Trustee group        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period       1 year
Minimum | Employee group        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 2 years 1 year 1 year 1 year
Maximum | Trustee group        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period       3 years
Maximum | Employee group        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 3 years 4 years 3 years 4 years