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Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Investment in Marketable Securities [Abstract] |
Investments | The Company makes strategic investments in equity and debt securities of silver and gold exploration, development and royalty and streaming companies.
| At December 31, 2020
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 166 |  |  | $ | — |  |  | $ | 875 |  |  | $ | 1,041 |
Integra Resources Corp. | 7,500 |  |  | — |  |  | 4,401 |  |  | 11,901 |
Other | 2 |  |  | (1) |  |  | — |  |  | 1 |
Equity securities | $ | 7,668 |  |  | $ | (1) |  |  | $ | 5,276 |  |  | $ | 12,943 |
| At December 31, 2019
In thousands | Cost |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Estimated Fair Value
Equity Securities |  |  |  |  |  |  |
Metalla Royalty & Streaming Ltd. | $ | 10,463 |  |  | $ | — |  |  | $ | 17,725 |  |  | $ | 28,188 |
Integra Resources Corp. | 5,000 |  |  | — |  |  | 355 |  |  | 5,355 |
Rockhaven Resources, Ltd. | 2,064 |  |  | (376) |  |  | — |  |  | 1,688 |
Other | 1,304 |  |  | (889) |  |  | — |  |  | 415 |
Equity securities | $ | 18,831 |  |  | $ | (1,265) |  |  | $ | 18,080 |  |  | $ | 35,646 |
Unrealized Gain (Loss) on Investments | The following table presents the disaggregated gain (loss) on equity securities recognized in Income (loss) from continuing operations on the Consolidated Statements of Comprehensive Income:
|  |  | Year ended December 31,
In thousands |  |  |  |  | 2020 |  | 2019 |  | 2018
Net gain (loss) |  |  |  |  | $ | 7,601 |  |  | $ | 16,208 |  |  | $ | 2,945 |
Less: Realized (gain) loss |  |  |  |  | (19,140) |  |  | (860) |  |  | (7,964) |
Unrealized gain (loss) |  |  |  |  | $ | (11,539) |  |  | $ | 15,348 |  |  | $ | (5,019) |

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