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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Discontinued Operations        
Income (loss) from continuing operations attributable to common shareholders $ 76,367 $ 58,180 $ 170,294 $ 181,783
Income (loss) from discontinued operations attributable to common shareholders 67 3,353 420,764 26,121
Net income attributable to common shareholders $ 76,434 $ 61,533 $ 591,058 $ 207,904