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Pension Plans and Other Postretirement Benefits (Details 4) (Postretirement Benefit Costs [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Postretirement Benefit Costs [Member]
      
Change in accumulated postretirement benefit obligations:      
Projected benefit obligation at beginning of year $ 3,326 $ 3,489 $ 4,470
Changes during fiscal year      
Service cost         
Interest cost 91 122 170
Medicare prescription reimbursements         
Employer payments net of participant contributions (488) (526) (744)
Actuarial loss (gain) (67) 241 (407)
Projected benefit obligation at end of year 2,862 3,326 3,489
Funded status (2,862) (3,326) (3,489)
Total amount recognized in Consolidated Balance Sheets, all in other liabilities (2,862) (3,326) (3,489)
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI"):      
Prior service cost         
Net actuarial loss (gain) (900) (1,355) (2,097)
Total amount recognized in AOCI $ (900) $ (1,355) $ (2,097)