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Discontinued Operations and Related Assets Held for Sale - Narratives (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 03, 2017
Nov. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash received from divestitures     $ 0 $ 27,254 $ 15,889
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 5,300 119,907
Cash received from divestitures       $ 27,254 $ 15,889
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Fiber Materials Inc.          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash received from divestitures   $ 15,900      
Loss on sale of business   200      
Potential Proceeds from Business Divested   $ 8,500      
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Advanced Energy Technologies [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash received from divestitures $ 28,500