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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings per Share [Line Items]        
Basic weighted-average shares outstanding 67,316 67,176 67,265 67,321
Diluted weighted-average shares outstanding 67,732 67,359 67,664 67,321
Performance shares [Member]        
Earnings per Share [Line Items]        
Incremental shares 355 153 343  
Restricted stock units [Member]        
Earnings per Share [Line Items]        
Incremental shares 61 30 56