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Sales of Manufacturing Facilities:Assets Held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Loss (Gain) on Disposal   $ 38,314 $ 0 $ 0  
Goodwill, Impairment Loss   1,250      
Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Revenue   32,700 28,200    
Disposal Group, Operating Income (Loss)   (7,000) $ (9,800)    
Disposal Group, Loss (Gain) on Disposal $ 24,000        
Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Loss on sale and curtailment of facilities [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Loss (Gain) on Disposal   24,000      
Goodwill, Impairment Loss   300      
Severance-related expenses   $ 300      
Subsequent Event [Member] | Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Consideration Received         $ 3,500