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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, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Discontinued Operations        
Income (loss) from continuing operations attributable to common shareholders $ 125,090 $ (21,166) $ 127,350 $ (1,461)
Income (loss) from discontinued operations attributable to common shareholders 2,598 82,660 19,021 90,998
Net income (loss) attributable to common shareholders/unitholders $ 127,688 $ 61,494 $ 146,371 $ 89,537