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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
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [2]
Jun. 30, 2017
 [3]
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
 [4]
Jun. 30, 2016
 [3]
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Number of common share equivalent securities excluded from the diluted earnings per share calculation                 1,500 2,400 2,600
Income from continuing operations attributable to common shareholders                 $ 196,422 $ 436,981 $ 229,565
Amount allocated to participating securities                 (660) (6,304) (2,052)
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities                 195,762 430,677 227,513
Discontinued operations, including gain on sale, attributable to common shareholders                 0 382,842 19,750
Net income attributable to common shareholders - basic                 $ 195,762 $ 813,519 $ 247,263
Earnings per common share from continuing operations                 $ 2.14 $ 4.81 $ 2.55
Earnings per common share from discontinued operations                 0.00 4.27 0.22
Total earnings per common share - basic $ 0.92 $ 0.38 $ 0.43 $ 0.39 $ 0.45 $ 3.23 $ 4.94 $ 0.46 $ 2.14 [5] $ 9.08 [5] $ 2.77
Weighted average number of common shares outstanding – basic                 91,499 89,580 89,120
Income allocated to common units from continuing operations       $ 0         $ 1,174 $ 0  
Income from continuing operations attributable to common shareholders, as adjusted                 196,936 430,677 $ 227,513
Net income attributable to common shareholders - diluted                 $ 196,936 $ 813,519 $ 247,263
Earnings per common share from continuing operations                 $ 2.13 $ 4.79 $ 2.54
Earnings per common share from discontinued operations                 0.00 4.26 0.22
Total earnings per common share - diluted $ 0.91 $ 0.38 $ 0.43 $ 0.39 $ 0.45 $ 3.21 $ 4.92 $ 0.46 $ 2.13 [5] $ 9.05 [5] $ 2.76
Common share options and share awards granted                 211 323 370
Common units       0         805 0  
Weighted average number of common shares outstanding - diluted                 92,515 89,903 89,490
[1] Includes a $43,231, or $0.46 basic and $0.45 diluted per share, impact related to a gain on sale of one operating property.
[2] Includes a $4,987, or $0.05 basic and diluted per share, impact related to expenses due to Hurricanes Harvey and Irma.
[3] Includes a $32,235, or $0.36 basic and diluted per share, impact related to a gain on sale of one operating property.
[4] Includes a $262,719, or $2.93 basic and $2.92 diluted per share, impact related to a gain on sale of one dual-phased operating property and five other operating properties.
[5] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income per share amounts may not equal the total computed for the year.