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Net Income (Loss) Per Common Share (Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net income (loss) attributable to common shareholders $ (36,390) $ 47,569
Less: Dividends on participating securities (852) (799)
Basic net income (loss) attributable to common shareholders (37,242) 46,770
Noncontrolling interest in earnings of common unitholders 0 1,205
Diluted net income (loss) attributable to common shareholders $ (37,242) $ 47,975
Weighted average number of common shares outstanding 258,365 252,406
Weighted average partnership Units outstanding 0 6,384
Other potential dilutive shares 0 47
Weighted average number of common shares and potential dilutive securities 258,365 258,837
3.75% Exchangeable Senior Notes [Member]
   
Interest rate stated on the debt instrument 3.75%