Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]
Gain (Loss) on Sale of Equity Investments	$ 16,208	$ 2,945	$ 1,356
Marketable Securities, Realized Gain (Loss)	(860)	(7,964)	(1,356)
Unrealized gain (loss) on equity securities	15,348	(5,019)	0
Investment in Marketable Securities (Textual) [Abstract]
Debt Securities, Held-to-maturity, Restricted	8,800	12,300
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	18,831	14,135
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(1,264)	(1,398)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	18,080	2,852
Available-for-sale Securities	35,646	15,589
Debt Securities, Available-for-sale [Abstract]
Marketable Securities, Realized Gain (Loss)	(860)	(7,964)	$ 0
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	10,463	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	17,725	2,852
Available-for-sale Securities	28,188	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
Integra Resources Corp. [Member] \| Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	5,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	355
Available-for-sale Securities	5,355
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	(376)	(452)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities	1,688	1,612
Other Investments [Member] \| Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	1,304	1,376
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(888)	(946)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities	415	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

Investments in marketable securities.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of unrealized gain (loss) on investment in marketable security.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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