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Statements of Consolidated Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Tax provision (benefit) for recognized net actuarial loss $ 196 $ 219  
Tax provision $ 21 $ 245  
Cash dividends declared per share $ 0.80 $ 0.80 $ 0.80
Common Shares [Member]      
Issuance of common shares 10,332 1,899 3,531
Restricted shares awards 4,799 20,164 42,678
Common Shares Issued to Rabbi Trust [Member]      
Common shares issued to rabbi trust 646 7,113 43,592
Deferred Compensation Liability [Member]      
Common shares issued to rabbi trust 646 7,113 43,592
Paid In Capital [Member]      
Issuance of common shares 10,332 1,899 3,531
Restricted shares awards 4,799 20,164 42,678
Retained Earnings [Member]      
Cash dividends declared per share $ 0.80 $ 0.80 $ 0.80
Treasury Stock [Member]      
Purchase of common shares 118,430 198,589 40,145
Unrecognized Pension Benefit Cost [Member]      
Tax provision (benefit) for recognized net actuarial loss $ 196 $ 219 $ 6
Tax provision $ 21 $ 245 $ 3,115