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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investment in Marketable Securities [Abstract] |
Investments |
| At December 31, 2016
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Kootenay Silver, Inc. | $ | 2,645 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,645 |
Silver Bull Resources, Inc. | 233 |  |  | — |  |  | 783 |  |  | 1,016 |
Other | 229 |  |  | — |  |  | 598 |  |  | 827 |
Equity securities | $ | 3,107 |  |  | $ | — |  |  | $ | 1,381 |  |  | $ | 4,488 |
| At December 31, 2015
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Paramount Gold Nevada Corp. | $ | 1,470 |  |  | $ | (1,036 | ) |  | $ | — |  |  | $ | 434 |
Northair Silver Corp. | 725 |  |  | — |  |  | 9 |  |  | 734 |
Agnico-Eagle Mines Ltd. | 420 |  |  | — |  |  | 518 |  |  | 938 |
Silver Bull Resources, Inc. | 305 |  |  | — |  |  | — |  |  | 305 |
Other | 466 |  |  | (143 | ) |  | 32 |  |  | 355 |
Equity securities | $ | 3,386 |  |  | $ | (1,179 | ) |  | $ | 559 |  |  | $ | 2,766 |

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