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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 | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Earnings Per Share [Abstract] |  |  |
Number of common share equivalent securities excluded from the diluted earnings per share calculation | 1,000 | 1,900 | 1,100
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent | $ 303,907 | $ 123,911 | $ 219,623
Amount allocated to participating securities | (545) | (261) | (539)
Net Income (Loss) Available to Common Stockholders, Basic | $ 303,362 | $ 123,650 | $ 219,084
Total earnings per common share - basic | $ 2.97 | $ 1.24 | $ 2.23
Weighted average number of common shares outstanding – basic | 101,999 | 99,385 | 98,460
Income allocated to common units from continuing operations | $ 1,190 | $ 0 | $ 1,593
Net income attributable to common shareholders - diluted | $ 304,552 | $ 123,650 | $ 220,677
Total earnings per common share - diluted | $ 2.96 | $ 1.24 | $ 2.22
Common share options and share awards granted | 87 | 53 | 119
Common units | 743 | 0 | 805
Weighted average number of common shares outstanding - diluted | 102,829 | 99,438 | 99,384

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