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Share-based Compensation (Details)
9 Months Ended
Sep. 30, 2020
shares
Performance based restricted stock unit  
Share-based Compensation  
Number of shares of common stock per award 1
Restricted stock unit  
Share-based Compensation  
Number of shares of common stock per award 1
Deferred stock units  
Share-based Compensation  
Number of shares of common stock per award 1
Vesting period 1 year
Settlement period 30 days
Minimum | Restricted stock unit  
Share-based Compensation  
Requisite service periods 1 year
Maximum | Restricted stock unit  
Share-based Compensation  
Requisite service periods 5 years