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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investment in Marketable Securities [Abstract] |
Investments |
| At March 31, 2018
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,294 |  |  | $ | — |  |  | $ | 2,837 |  |  | $ | 9,131 |
Corvus Gold Inc. | 3,582 |  |  | — |  |  | 6,844 |  |  | 10,426 |
Almaden Minerals, Ltd. | 2,067 |  |  | (727 | ) |  | — |  |  | 1,340 |
Northern Empire Resources Corp. | 4,489 |  |  | — |  |  | 2,999 |  |  | 7,488 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (596 | ) |  | — |  |  | 1,468 |
Other | 1,190 |  |  | (155 | ) |  | 115 |  |  | 1,150 |
Equity securities | $ | 19,686 |  |  | $ | (1,478 | ) |  | $ | 12,795 |  |  | $ | 31,003 |
Debt Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,677 |  |  | $ | (363 | ) |  | $ | — |  |  | $ | 6,314 |
Equity and debt securities | $ | 26,363 |  |  | $ | (1,841 | ) |  | $ | 12,795 |  |  | $ | 37,317 |
| At December 31, 2017
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,294 |  |  | $ | — |  |  | $ | 1,354 |  |  | $ | 7,648 |
Corvus Gold Inc. | 3,582 |  |  | — |  |  | 4,518 |  |  | 8,100 |
Almaden Minerals, Ltd. | 3,125 |  |  | (235 | ) |  | — |  |  | 2,890 |
Northern Empire Resources Corp. | 4,489 |  |  | — |  |  | 1,077 |  |  | 5,566 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (193 | ) |  | — |  |  | 1,871 |
Kootenay Silver, Inc. | 738 |  |  | — |  |  | 1 |  |  | 739 |
Other | 1,479 |  |  | (453 | ) |  | 405 |  |  | 1,431 |
Equity securities | $ | 21,771 |  |  | $ | (881 | ) |  | $ | 7,355 |  |  | $ | 28,245 |
Debt Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 6,677 |  |  | $ | (85 | ) |  | $ | — |  |  | $ | 6,592 |
Equity and debt securities | $ | 28,448 |  |  | $ | (966 | ) |  | $ | 7,355 |  |  | $ | 34,837 |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following table presents the disaggregated gain (loss) on equity securities recognized in Income (loss) from continuing operations on the Condensed Consolidated Statements of Comprehensive Income:
| Three months ended March 31,
In thousands | 2018 |  | 2017
Net gain (loss) | $ | 4,529 |  |  | $ | (1,471 | )
Less: Realized (gain) loss | 313 |  |  | 1,471 |
Unrealized gain (loss) | $ | 4,842 |  |  | $ | — |
Schedule of Unrealized Loss on Investments [Table Text Block] | The following table summarizes unrealized losses on debt 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 March 31, 2018:
| Less than twelve months |  | Twelve months or more |  | Total
In thousands | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value |  | Unrealized Losses | Fair Value
Debt securities | 363 |  | 6,314 |  |  | — |  | — |  |  | 363 |  | 6,314 |

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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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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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