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Stock-Based Incentive Plans - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement, compensation cost $ 100  
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement, vesting period 2 years  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement, vesting period 4 years  
Continuing Operations    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 9,536 $ 9,043
Service-based restricted stock units (“RSUs”) | Continuing Operations    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 4,842 4,478
Service-based stock appreciation rights (“SARs”) | Continuing Operations    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 3,322 2,684
Market performance-based restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement, vesting period 3 years  
Market performance-based restricted stock units | Continuing Operations    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 763 896
Operating performance-based restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement, vesting period 3 years  
Operating performance-based restricted stock units | Continuing Operations    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 267 695
Employee share purchase plan | Continuing Operations    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 342 $ 290