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Investments (Tables) | 9 Months Ended
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Sep. 30, 2016
Investment in Marketable Securities [Abstract] |
Investments |
| At September 30, 2016
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Kootenay Silver, Inc. | $ | 3,366 |  |  | $ | — |  |  | $ | 1,295 |  |  | $ | 4,661 |
Silver Bull Resources, Inc. | 232 |  |  | — |  |  | 1,175 |  |  | 1,407 |
Other | 191 |  |  | (51 | ) |  | — |  |  | 140 |
Equity securities | $ | 3,789 |  |  | $ | (51 | ) |  | $ | 2,470 |  |  | $ | 6,208 |
| 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 |
Gross unrealized losses on investment securities | The following table summarizes the gross unrealized losses on equity securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at September 30, 2016:
| Less than twelve months |  | Twelve months or more |  | Total
In thousands | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value
Equity securities | $ | (51 | ) | $ | 7 |  |  | $ | — |  | $ | — |  |  | $ | (51 | ) | $ | 7 |

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- Definition Investment in marketable securities. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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