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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
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings per Share [Line Items]      
Basic weighted-average shares outstanding 67,237 67,608 60,534
Diluted weighted-average shares outstanding 67,568 67,743 61,814
Performance shares [Member]      
Earnings per Share [Line Items]      
Incremental shares 289 109 230
Restricted stock units [Member]      
Earnings per Share [Line Items]      
Incremental shares 42 26 34
Stock portion of earnings and profits distribution [Member]      
Earnings per Share [Line Items]      
Incremental shares     1,016