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Fair Value Accounting (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value Accounting |  |  |
Other investments | $ 5,462 | $ 3,746 |
Fair Value Transfers Between Levels |  | 0 |
Midas Gold Shares |  |  |
Fair Value Accounting |  |  |
Other investments | 5,462 | 3,746 | $ 4,994
Recurring | Marketable Securities (Other Than Midas Gold Shares) |  |  |
Fair Value Accounting |  |  |
Marketable securities |  | 90 |
Recurring | Midas Gold Shares |  |  |
Fair Value Accounting |  |  |
Other investments | 5,462 | 3,746 |
Recurring | Fair Value, Inputs, Level 1 | Marketable Securities (Other Than Midas Gold Shares) |  |  |
Fair Value Accounting |  |  |
Marketable securities |  | 90 |
Recurring | Fair Value, Inputs, Level 1 | Midas Gold Shares |  |  |
Fair Value Accounting |  |  |
Other investments | 5,462 | 3,746 |
Non-recurring | Used mill equipment, Canada |  |  |
Fair Value Accounting |  |  |
Used mill equipment (non-recurring) | 5,500 | 6,500 |
Non-recurring | Fair Value, Inputs, Level 3 | Used mill equipment, Canada |  |  |
Fair Value Accounting |  |  |
Used mill equipment (non-recurring) | $ 5,500 | $ 6,500 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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