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Operating Lease Agreements (Tables)
12 Months Ended
Dec. 31, 2011
Operating Lease Agreements [Abstract]  
Future Minimum Rental Commitments
(Dollars in thousands)
     
2012
  $ 11,914  
2013
    11,624  
2014
    9,973  
2015
    9,962  
2016
    9,954  
Thereafter
    33,986  
Net commitments
  $ 87,413