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Share Repurchases (Tables)
 12 Months Ended
Dec. 31, 2012
Share Repurchases [Abstract]  
Summary of share repurchases under a stock repurchase plan
                 
     shares     (thousands)  

Authorized amount

     n/a     $ 25,000  

Repurchases

     291,120       (4,462 ) 

Remaining authorization

           $ 20,538