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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
Mar. 31, 2014
Mar. 31, 2013
Discontinued Operations    
Income (loss) from continuing operations attributable to common shareholders $ 2,260 $ 19,833
Income (loss) from discontinued operations attributable to common shareholders 16,423 8,210
Net income (loss) attributable to common shareholders/unitholders $ 18,683 $ 28,043