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Stock Plans - Additional Information (Details)
6 Months Ended
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of target award based on achieving specified performance targets 237.60%
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of target award based on achieving targeted performance conditions 0.00%
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of target award based on achieving targeted performance conditions 200.00%
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value assumptions, average closing price used to calculate expected dividend rate, period (years) 1 year
Stock beta, daily price data period (years) 10 years
Award vesting period (in years) 3 years