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Stock-Based Incentive Plans (Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 7,810 $ 8,531 $ 26,845 $ 24,127
Share-based compensation arrangement, vesting period     4 years  
Share-based compensation arrangement, compensation cost 3,300   $ 6,600  
Service-based restricted stock units (“RSUs”)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 4,410 3,583 13,139 10,428
Service-based stock appreciation rights (“SARs”)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 3,211 2,896 9,185 7,804
Market performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 814 757 $ 2,745 2,146
Share-based compensation arrangement, vesting period 3 years   3 years  
Operating performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ (962) 983 $ 882 2,752
Share-based compensation arrangement, vesting period     3 years  
Employee share purchase plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 337 $ 312 $ 894 $ 997