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Restructuring Charges (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Centralization Of Global Sales And Marketing Structure      
Restructuring Cost and Reserve [Line Items]      
Restructuring expense   $ 10,700 $ 12,000
Cumulative Charges Incurred   22,726  
Workforce Reduction Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring expense   27,953  
Cumulative Charges Incurred   27,953  
Percentage of positions eliminated or furloughed 23.00%    
Severance costs   $ 28,000