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Shareholders' Equity Part 1 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity Note [Abstract]        
Number of shares authorized for issue 61,000,000      
Common Stock, authorized (in shares) 60,000,000 60,000,000 60,000,000  
Common Stock, par value (in dollars per share) $ 0.375 $ 0.375 $ 0.375  
Preferred Stock, authorized (in shares) 1,000,000 1,000,000 1,000,000  
Preferred Stock, par value (in dollars per share) $ 0.02 $ 0.02 $ 0.02  
Class of Warrant or Right        
Preferred Stock, par value (in dollars per share) $ 0.02 $ 0.02 $ 0.02  
Accumulated Other Comprehensive Loss, Net of Tax        
Foreign currency translation adjustments $ (44,444) $ (19,371) $ (44,585) $ (32,090)
Pension and retiree medical benefits (5,391) (5,010) (3,647) (6,503)
Cash flow hedge (88) (4,045) 103 0
Total Accumulated Other Comprehensive Loss $ (49,923) $ (28,426) $ (48,129) $ (38,593)
Purchase Rights        
Stockholders' Equity Note [Abstract]        
Preferred Stock, par value (in dollars per share) $ 0.02      
Class of Warrant or Right        
Preferred Share purchase right dividend declared per common share outstanding (in shares) 1      
Preferred Stock, par value (in dollars per share) $ 0.02      
Exercise price per each Series A Junior Participating Preferred Stock (in dollars per share) $ 100      
Number of Series A Junior Participating Preferred shares the Rights holder is entitled to purchase (in shares) 0.01      
Maximum threshold of common stock ownership 20.00%      
Redemption price per right $ 0.001      
Minimum threshold of common stock ownership 10.00%      
Preferred Share purchase rights expiration date Dec. 26, 2016