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Share-Based Payments - Restricted Share Units Issued to Non-employee Directors (Details) - Restricted Share Units
12 Months Ended
Dec. 31, 2018
shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Outstanding (in shares) 362,572
Management  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 108,455
Vested (in shares) (96,510)
Forfeited (in shares) 4,957
Outstanding (in shares) 6,988
Grants 2016  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 328,550
Vested (in shares) (186,862)
Forfeited (in shares) 82,728
Outstanding (in shares) 58,960
Grants 2016 | Non-Employee Directors  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 24,456
Vested (in shares) (21,352)
Forfeited (in shares) 3,104
Outstanding (in shares) 0
Grants 2016 | Chairman  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 10,952
Vested (in shares) (10,952)
Forfeited (in shares) 0
Outstanding (in shares) 0
Grants 2017  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 200,021
Vested (in shares) (62,433)
Forfeited (in shares) 37,035
Outstanding (in shares) 100,553
Grants 2017 | Non-Employee Directors  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 22,230
Vested (in shares) (20,377)
Forfeited (in shares) 1,853
Outstanding (in shares) 0
Grants 2017 | Chairman  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 8,892
Vested (in shares) (8,892)
Forfeited (in shares) 0
Outstanding (in shares) 0
Grants 2018  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 228,251
Vested (in shares) 0
Forfeited (in shares) 25,192
Outstanding (in shares) 203,059
Grants 2018 | Non-Employee Directors  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 29,024.7678018576
Vested (in shares) (24,187.306501548)
Forfeited (in shares) 0
Outstanding (in shares) 4,838
Grants 2018 | Chairman  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Granted (in shares) 12,899.8968008256
Vested (in shares) (10,749.914000688)
Forfeited (in shares) 0
Outstanding (in shares) 2,150