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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]  
Schedule Of Income Taxes
    Three months ended  
    March 31,     March 31,  
($ in thousands)   2012     2011  
Provision (benefit) for income taxes   $ 4,525     $ (29,446 )
Effective tax rate     (19 %)     21 %