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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Discontinued Operations        
Income (loss) from continuing operations attributable to common shareholders $ (21,070) $ (30,454) $ (1,124) $ (71,352)
Income (loss) from discontinued operations attributable to common shareholders 82,564 1,972 90,661 6,480
Net income (loss) attributable to common shareholders/unitholders $ 61,494 $ (28,482) $ 89,537 $ (64,872)