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Income per Common Share of the Trust (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income                      
Income from continuing operations net of noncontrolling interest                 $ 160,677 $ 242,066 $ 330,320
Discontinued operations                 318,930 40,274 26,497
Income available to common shareholders                 $ 479,607 $ 282,340 $ 356,817
Weighted Average Shares                      
Income from continuing operations net of noncontrolling interest - basic (shares)                 147,275 146,742 146,204
Dilutive shares/units for long-term compensation plans (shares)                 946 799 685
Income from continuing operations net of noncontrolling interest - diluted (shares)                 148,221 147,541 146,889
Per Share/Unit                      
Income from continuing operations net of noncontrolling interest - basic (USD per share/unit)                 $ 1.09 $ 1.65 $ 2.26
Discontinued operations net of noncontrolling interest - basic (USD per share/unit)                 2.17 0.27 0.18
Net income available to common shareholders - basic (USD per share/unit) $ 1.15 $ 1.02 $ 0.13 $ 0.95 $ 0.87 $ 0.41 $ 0.35 $ 0.29 3.26 1.92 2.44
Per Share                      
Income from continuing operations net of noncontrolling interest - diluted (USD per share/unit)                 1.09 1.64 2.25
Discontinued operations net of noncontrolling interest - diluted (USD per share/unit)                 2.15 0.27 0.18
Income per common share - diluted (USD per share/unit) $ 1.14 $ 1.01 $ 0.13 $ 0.95 $ 0.87 $ 0.40 $ 0.35 $ 0.29 $ 3.24 $ 1.91 $ 2.43