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Fair Value Accounting (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair Value Accounting |  |  |
Other investments | $ 3,676 | $ 5,462 | $ 3,746
Used mill equipment (non-recurring) |  | 5,500 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value Accounting |  |  |
Other investments | $ 3,676 | 5,462 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Accounting |  |  |
Used mill equipment (non-recurring) |  | $ 5,500 |

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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