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Accumulated Other Comprehensive Income (Table)
9 Months Ended
Sep. 30, 2011
Accumulated Other Comprehensive Income Loss Net Of Tax Abstract 
Accumulated Other Comprehensive Income (Loss)
    Nine Months Ended
    September 30,
    2011 2010
(Dollars in thousands)   
Equity Method Investments       
Balance, beginning of period $390  $306 
 Add (deduct):       
  Net unrealized gain (loss) on equity investments 138   84 
Balance, end of period$528  $390 
           
Retirement Plans       
Balance, beginning of period$(3,598) $(3,016)
 Add (deduct):       
 Amounts included in net periodic benefit cost for the period       
  Amortization of prior service cost (2,861)  (2,861)
  Amortization of unrecognized net loss 1,440   1,618 
     (1,421)  (1,243)
  Deferred income taxes  1,568   474 
 Changes related to retirement plan 147   (769)
Balance, end of period$(3,451) $(3,785)
           
Accumulated Other Comprehensive Income (Loss)       
Balance, beginning of period$(3,208) $(2,710)
 Add (deduct):       
  Net unrealized gain (loss) on equity investments 138   84 
  Changes related to retirement plan 147   (769)
Balance, end of period$(2,923) $(3,395)