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Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tax provision (benefit) for recognized net actuarial loss $ 199 $ 196  
Tax provision $ (247) $ 21  
Cash dividends declared per share $ 0.80 $ 0.80 $ 0.80
Common Shares [Member]      
Issuance of common shares 36,221 10,332 1,899
Restricted shares awards 5,859 4,799 20,164
Common Shares Issued to Rabbi Trust [Member]      
Common shares issued to rabbi trust   646 7,113
Common shares distributed from rabbi trust 8,255    
Deferred Compensation Liability [Member]      
Common shares issued to rabbi trust   646 7,113
Common shares distributed from rabbi trust 8,255    
Paid In Capital [Member]      
Issuance of common shares 36,221 10,332 1,899
Restricted shares awards 5,859 4,799 20,164
Retained Earnings [Member]      
Cash dividends declared per share $ 0.80 $ 0.80 $ 0.80
Treasury Stock [Member]      
Purchase of common shares 121,626 118,430 198,589
Unrecognized Pension Benefit Cost [Member]      
Tax provision (benefit) for recognized net actuarial loss $ 199 $ 196 $ 219
Tax provision $ 247 $ 21 $ 245