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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, 2016
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [2]
Mar. 31, 2016
Dec. 31, 2015
 [3]
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
 [4]
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Number of common share equivalent securities excluded from the diluted earnings per share calculation                 2,400 2,600 2,800
Income from continuing operations attributable to common shareholders                 $ 436,981 $ 229,565 $ 273,892
Amount allocated to participating securities                 (6,304) (2,052) (2,687)
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities                 430,677 227,513 271,205
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 382,842 19,750 18,197
Net income attributable to common shareholders - basic                 $ 813,519 $ 247,263 $ 289,402
Earnings per common share from continuing operations                 $ 4.81 $ 2.55 $ 3.08
Earnings per common share from discontinued operations                 4.27 0.22 0.21
Total earnings per common share - basic $ 0.45 $ 3.23 $ 4.94 $ 0.46 $ 0.67 $ 0.41 $ 0.40 $ 1.29 $ 9.08 [5] $ 2.77 [5] $ 3.29
Weighted average number of common shares outstanding - basic                 89,580 89,120 88,084
Net income attributable to common shareholders - diluted                 $ 813,519 $ 247,263 $ 289,402
Earnings per common share from continuing operations                 $ 4.79 $ 2.54 $ 3.06
Earnings per common share from discontinued operations                 4.26 0.22 0.21
Total earnings per common share - diluted $ 0.45 $ 3.21 $ 4.92 $ 0.46 $ 0.67 $ 0.41 $ 0.40 $ 1.27 $ 9.05 [5] $ 2.76 [5] $ 3.27
Common share options and share awards granted                 323 370 384
Weighted average number of common shares outstanding - diluted                 89,903 89,490 88,468
[1] 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.
[2] Includes a $32,235, or $0.36 basic and diluted per share, impact related to a gain on sale of one operating property.
[3] Includes an $18,870, or $0.21 basic and diluted per share, impact related to a gain on sale of one operating property.
[4] Includes an $85,192, or $0.96 basic and $0.94 diluted per share, impact related to a gain on sale of two operating properties and land.
[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.