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Sales of Manufacturing Facilities:Sale of Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2019
Nov. 02, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of facilities     $ 0 $ 2,493 $ 15,003
Loss on sale and curtailment of facilities     $ 1,707 0 38,314
Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Revenue       5,500 32,700
Disposal Group, Operating Loss       $ (1,400) (7,000)
Proceeds from sale of facilities $ 2,500        
Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] | Disposal Group, Disposed of by 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]          
Loss on sale and curtailment of facilities         24,000
Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Revenue         74,100
Disposal Group, Operating Loss         (200)
Proceeds from sale of facilities   $ 15,000      
Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member] | Disposal Group, Disposed of by 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]          
Loss on sale and curtailment of facilities         $ 11,500