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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
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Discontinued Operations      
Income (loss) from continuing operations attributable to common shareholders $ 22,982 $ (135,724) $ (65,463)
Income (loss) from discontinued operations attributable to common shareholders 130,062 9,579 96,879
Net income (loss) attributable to common shareholders $ 153,044 $ (126,145) $ 31,416