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Investments (Tables) | 3 Months Ended
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Mar. 31, 2019
Investment in Marketable Securities [Abstract] |
Investments |
| At March 31, 2019
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 11,803 |  |  | $ | — |  |  | $ | 12,055 |  |  | $ | 23,858 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (475 | ) |  | — |  |  | 1,589 |
Other | 1,356 |  |  | (928 | ) |  | — |  |  | 428 |
Equity securities | $ | 15,223 |  |  | $ | (1,403 | ) |  | $ | 12,055 |  |  | $ | 25,875 |
| At December 31, 2018
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 10,695 |  |  | $ | — |  |  | $ | 2,852 |  |  | $ | 13,547 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (452 | ) |  | — |  |  | 1,612 |
Other | 1,376 |  |  | (946 | ) |  | — |  |  | 430 |
Equity securities | $ | 14,135 |  |  | $ | (1,398 | ) |  | $ | 2,852 |  |  | $ | 15,589 |
Debt Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 2,271 |  |  | $ | (54 | ) |  | $ | — |  |  | $ | 2,217 |
Equity and debt securities | $ | 16,406 |  |  | $ | (1,452 | ) |  | $ | 2,852 |  |  | $ | 17,806 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
Schedule of Unrealized Loss on Investments [Table Text Block] | t March 31, 2019, there were no debt securities with unrealized losses.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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