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v3.19.1

Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 15,223 | $ 14,135
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,403) | (1,398)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 12,055 | 2,852
Available-for-sale Securities | 25,875 | 15,589
Equity and debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 16,406
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1,452)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 2,852
Available-for-sale Securities |  | 17,806
Metalla Royalty & Streaming Ltd. | Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 11,803 | 10,695
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 12,055 | 2,852
Available-for-sale Securities | 23,858 | 13,547
Metalla Royalty & Streaming Ltd. | Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 2,271
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (54)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0
Available-for-sale Securities |  | 2,217
Rockhaven Resources, Ltd. [Member] | Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2,064 | 2,064
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (475) | (452)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities | 1,589 | 1,612
Other Investments [Member] | Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,356 | 1,376
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (928) | (946)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities | 428 | 430
Level 3 | Equity and debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities |  | $ 2,217
Available-for-sale Securities | Level 3 | Equity and debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 0 |

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