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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

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