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Investments (Tables) | 6 Months Ended
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Jun. 30, 2017
Investment in Marketable Securities [Abstract] |
Investments | These investments are classified as available-for-sale and are measured at fair value in the financial statements with unrealized gains and losses recorded in Other comprehensive income (loss).
| At June 30, 2017
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Almaden Minerals, Ltd. | $ | 3,125 |  |  | $ | — |  |  | $ | 461 |  |  | $ | 3,586 |
Northern Empire Resources Corp. | 2,999 |  |  | — |  |  | 41 |  |  | 3,040 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (197 | ) |  | — |  |  | 1,867 |
Kootenay Silver, Inc. | 1,291 |  |  | — |  |  | — |  |  | 1,291 |
Other | 1,518 |  |  | (45 | ) |  | 615 |  |  | 2,088 |
Equity securities | $ | 10,997 |  |  | $ | (242 | ) |  | $ | 1,117 |  |  | $ | 11,872 |
| 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 |
Schedule of Unrealized Loss on Investments [Table Text Block] | The following table summarizes 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 June 30, 2017:
| 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 | $ | (242 | ) | $ | 2,083 |  |  | $ | — |  | $ | — |  |  | $ | (242 | ) | $ | 2,083 |

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- Definition Investment in marketable securities. + References No definition available. + Details
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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=82897076&loc=d3e27290-111563 + Details
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