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Share-based Compensation (Details) - shares
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Share-based Compensation    
Number of shares held in treasury 713,456 310,745
RSU    
Share-based Compensation    
Number of shares of common stock per award 1  
Minimum | RSU    
Share-based Compensation    
Requisite service periods 1 year  
Maximum | RSU    
Share-based Compensation    
Requisite service periods 5 years  
Board of directors and advisory directors | DSUs    
Share-based Compensation    
Number of shares of common stock per award 1  
Settlement period 30 days