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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Discontinued Operations                      
Income (loss) from continuing operations attributable to common shareholders                 $ 428,531 $ 379,865 $ 288,075
Income (loss) from discontinued operations attributable to common shareholders                 441 3,864 1,346,356
Net income attributable to common shareholders $ 86,802 $ 226,566 $ 71,053 $ 44,551 $ 63,896 $ 53,025 $ 193,845 $ 72,963 $ 428,972 $ 383,729 $ 1,634,431