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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Discontinued Operations                      
Income (loss) from continuing operations attributable to common shareholders                 $ 310,156 $ 187,099 $ 174,419
Income (loss) from discontinued operations attributable to common shareholders                 1,987 428,211 30,474
Net income attributable to common shareholders $ 47,755 $ 112,014 $ 109,067 $ 43,307 $ 24,252 $ 76,434 $ 449,380 $ 65,244 $ 312,143 $ 615,310 $ 204,893