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Investments (Tables) | 6 Months Ended
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Jun. 30, 2019
Investment in Marketable Securities [Abstract] |
Investments | The Company makes strategic investments in equity and debt securities of silver and gold exploration and development companies.
| At June 30, 2019
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 10,985 |  |  | $ | — |  |  | $ | 6,528 |  |  | $ | 17,513 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (502 | ) |  | — |  |  | 1,562 |
Other | 1,305 |  |  | (923 | ) |  | — |  |  | 382 |
Equity securities | $ | 14,354 |  |  | $ | (1,425 | ) |  | $ | 6,528 |  |  | $ | 19,457 |
| 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 |

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