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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2011
Income Taxes  
Schedule Of Income Taxes
   
Three months ended
   
Six months ended
 
   
June 30,
   
June 30,
   
June 30,
   
June 30,
 
($ in thousands)
 
2011
   
2010
   
2011
   
2010
 
(Benefit) provision for income taxes
  $ 8,859     $ 5,468     $ (20,587 )   $ 21,798  
Effective tax rate
    49 %     23 %     17 %     33 %