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Shareholders' Equity Part 1 (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Note [Abstract]      
Number of shares authorized for issue (in shares) 60,000,000    
Common Stock, par value (in dollars per share) $ 0.375 $ 0.375  
Accumulated Other Comprehensive Loss, Net of Tax      
Foreign currency translation adjustments $ (15,778) $ (44,444) $ (44,585)
Pension and retiree medical benefits (1,610) (5,391) (3,647)
Cash flow hedge (4,935) (88) 103
Total Accumulated Other Comprehensive Loss $ (22,323) $ (49,923) $ (48,129)