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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Discontinued Operations                      
Income (loss) from continuing operations attributable to common shareholders                 $ 187,099 $ 174,419 $ 21,109
Income (loss) from discontinued operations attributable to common shareholders                 428,211 30,474 131,935
Net income attributable to common shareholders $ 24,252 $ 76,434 $ 449,380 $ 65,244 $ (3,011) $ 61,533 $ 127,688 $ 18,683 $ 615,310 $ 204,893 $ 153,044