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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
Mar. 31, 2016
Mar. 31, 2015
Discontinued Operations    
Income (loss) from continuing operations attributable to common shareholders $ 43,157 $ 36,994
Income (loss) from discontinued operations attributable to common shareholders 150 28,250
Net income attributable to common shareholders $ 43,307 $ 65,244