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Discontinued Operations, Assets Held for Sale and Impairments (Allocation of Shareholders' Income (Loss) Between Continuing and Discontinued Operations) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Discontinued Operations        
Income (loss) from continuing operations attributable to common shareholders $ 60,408 $ (15,874) $ 188,048 $ (17,741)
Income (loss) from discontinued operations attributable to common shareholders 1,125 9,807 19,856 101,211
Net income (loss) attributable to common shareholders/unitholders $ 61,533 $ (6,067) $ 207,904 $ 83,470