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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Discontinued Operations        
Income (loss) from continuing operations attributable to common shareholders $ 57,333 $ 120,013 $ 94,382 $ 118,272
Income (loss) from discontinued operations attributable to common shareholders 392,047 7,675 420,242 28,099
Net income (loss) attributable to common shareholders/unitholders $ 449,380 $ 127,688 $ 514,624 $ 146,371