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Stock-Based Incentive Plans (Allocation of Share-Based Compensation Costs by Type of Arrangement) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense from continuing operations $ 40,564 $ 35,089 $ 32,553
Continuing Operations      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense from continuing operations 40,564 35,089 32,553
Continuing Operations | Service-based restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense from continuing operations 19,614 18,320 14,113
Continuing Operations | Service-based stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense from continuing operations 12,489 12,715 10,349
Continuing Operations | Market performance-based restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense from continuing operations 3,522 3,200 2,900
Continuing Operations | Operating performance-based restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense from continuing operations 3,434 (370) 3,918
Continuing Operations | Employee stock purchase plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense from continuing operations $ 1,505 $ 1,224 $ 1,273