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Statements of Consolidated Shareholders' Equity (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Tax provision (benefit) for recognized net actuarial loss $ 187 $ 284 $ 156
Tax (benefit) 2,506 1,627 2,331
Curtailment net of tax provision 0 2,376  
Purchase of common shares 89,807 50,334 52,392
Issuance of common shares 34,575 20,365 26,353
Restricted shares awards 68,369 74,276 88,692
Common shares issued to rabbi trust 69,120 74,996 85,735
Cash dividends declared per share $ 0.60 $ 1.00 $ 0.80
Common Shares [Member]
      
Purchase of common shares 89,807 50,334 52,392
Issuance of common shares 34,575 20,365 26,353
Restricted shares awards 68,369 74,276 88,692
Common Shares Issued to Rabbi Trust [Member]
      
Common shares issued to rabbi trust 69,120 74,996 85,735
Deferred Compensation Liability [Member]
      
Common shares issued to rabbi trust 69,120 74,996 85,735
Paid In Capital [Member]
      
Issuance of common shares 34,575 20,365 26,353
Restricted shares awards 68,369 74,276 88,692
Retained Earnings [Member]
      
Purchase of common shares 89,807 50,334 52,392
Cash dividends declared per share $ 0.60 $ 1.00 $ 0.80
Defined Benefit Pension Plan Activity [Member]
      
Tax provision (benefit) for recognized net actuarial loss 187 284 156
Tax (benefit) 2,506 1,627 2,331
Curtailment net of tax provision   $ 2,376