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Discontinued Operations and Assets Held for Sale (Allocation of Shareholders' Income (Loss) Between Continuing and Discontinued Operations) (Details) - USD ($)
$ 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
Discontinued Operations                      
Income (loss) from continuing operations attributable to common shareholders                 $ 379,865 $ 288,075 $ 295,452
Income (loss) from discontinued operations attributable to common shareholders                 3,864 1,346,356 16,691
Net income attributable to common shareholders $ 63,896 $ 53,025 $ 193,845 $ 72,963 $ 188,419 $ 165,269 $ 1,210,543 $ 70,200 $ 383,729 $ 1,634,431 $ 312,143