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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Discontinued Operations                      
Income (loss) from continuing operations attributable to common shareholders                 $ 288,075 $ 295,452 $ 186,152
Income (loss) from discontinued operations attributable to common shareholders                 1,346,356 16,691 429,158
Net income attributable to common shareholders $ 188,419 $ 165,269 $ 1,210,543 $ 70,200 $ 47,755 $ 112,014 $ 109,067 $ 43,307 $ 1,634,431 $ 312,143 $ 615,310