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Earnings per Share (Reconciliation of Number of Shares Used in Calculating Basic and Diluted Earnings per Share) (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings per Share [Line Items]    
Basic weighted-average shares outstanding 67,207 67,478
Diluted weighted-average shares outstanding 67,607 67,478
Performance shares [Member]    
Earnings per Share [Line Items]    
Incremental shares 326  
Restricted stock units [Member]    
Earnings per Share [Line Items]    
Incremental shares 74