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Discontinued Operations and Related Assets Held for Sale (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 03, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Nov. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestiture of businesses         $ 15,900  
Gain (Loss) on Disposition of Business         (200)  
Fiber Materials Inc. [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Potential Earnings in Disposed Entity           $ 8,500
Discontinued Operations, Held-for-sale [Member] | Engineered Solutions [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impairment   $ 0 $ 2,500 $ 5,300 $ 120,000  
Gain (Loss) on Disposition of Business   $ 759 $ 0      
Discontinued Operations, Held-for-sale [Member] | Advanced Energy Technologies            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestiture of businesses $ 28,500