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Statements of Consolidated Shareholders' Equity (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Tax provision (benefit) for recognized net acturial loss $ 284 $ 156 $ 106
Tax (benefit) (1,627) (2,331) 96
Purchase of common shares 50,334 52,392 32,687
Issuance of common shares 20,365 26,353 14,168
Restricted shares awards 74,276 88,692 41,198
Cash dividends declared per share $ 1.00 $ 0.80 $ 0.80
Curtailment net of tax provision 2,376 0  
Common shares issued to rabbi trust 74,996 85,735 23,305
Common Shares
      
Purchase of common shares 50,334 52,392 32,687
Issuance of common shares 20,365 26,353 14,168
Restricted shares awards 74,276 88,692 41,198
Paid in Capital
      
Issuance of common shares 20,365 26,353 14,168
Restricted shares awards 74,276 88,692 41,198
Retained Earnings
      
Purchase of common shares 50,334 52,392 32,687
Cash dividends declared per share $ 1.00 $ 0.80 $ 0.80
Accumulated Other Comprehensive Income (Loss) Unrecognized Pension Benefit Cost
      
Tax provision (benefit) for recognized net acturial loss 284 156 106
Tax (benefit) (1,627) (2,331) 96
Curtailment net of tax provision $ 2,376    
Deferred Compensation Liability
      
Common shares issued to rabbi trust 74,996 85,735 23,305
Common Shares Issued to Rabbi Trust
      
Common shares issued to rabbi trust 74,996 85,735 23,305