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Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 14,354 | $ 14,135
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,425) | (1,398)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 6,528 | 2,852
Available-for-sale Securities | 19,457 | 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 | 10,985 | 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 | 6,528 | 2,852
Available-for-sale Securities | 17,513 | 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 | (502) | (452)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities | 1,562 | 1,612
Other Investments [Member] | Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,305 | 1,376
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (923) | (946)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities | 382 | 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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