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Per Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |  |  |
Number of common share equivalent securities excluded from the diluted earnings per share calculation |  | 1,900 | 1,100 | 2,100
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  | $ 123,911 | $ 219,623 | $ 156,128
Amount allocated to participating securities |  | (261) | (539) | (1,107)
Net Income (Loss) Available to Common Stockholders, Basic |  | $ 123,650 | $ 219,084 | $ 155,021
Total earnings per common share - basic | $ 1.63 | $ 1.24 | $ 2.23 | $ 1.63
Weighted average number of common shares outstanding – basic |  | 99,385 | 98,460 | 95,208
Income allocated to common units from continuing operations |  | $ 0 | $ 1,593 | $ 0
Net income attributable to common shareholders - diluted |  | $ 123,650 | $ 220,677 | $ 155,021
Total earnings per common share - diluted | $ 1.63 | $ 1.24 | $ 2.22 | $ 1.63
Common share options and share awards granted |  | 53 | 119 | 158
Common units |  | 0 | 805 | 0
Weighted average number of common shares outstanding - diluted | 95,366 | 99,438 | 99,384 | 95,366

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