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Investments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	$ 15,086		$ 15,086
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	9,364		9,364		$ 18,831
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(398)		(398)		(1,265)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	6,120		6,120		18,080
Available-for-sale Securities	15,086		15,086		35,646
Debt Securities, Available-for-sale [Abstract]
Marketable Securities, Realized Gain (Loss)	$ (12,340)	$ (384)	(12,340)	$ (375)
Equity and debt securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities					35,646
Metalla Royalty & Streaming Ltd.
Investment in Marketable Securities (Textual) [Abstract]
Proceeds from sale of equity method investments			20,700
Equity method investment, realized gain on disposal			11,600
Investment income, investment expense			$ 1,300
Equity method investment, amount sold (in shares)	3,910,000		3,910,000
Par value, common stock (in dollars per share)	$ 5.30		$ 5.30
Royalty interest, percent			0.3875%
Payments to acquire royalty interests in mining properties (in shares)			421,554
Equity method investment, realized gain on disposal			$ 1,400
Investment owned, balance (in shares)	909,756		909,756
Metalla Royalty & Streaming Ltd. | Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	$ 1,852		$ 1,852		10,463
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	2,964		2,964		17,725
Available-for-sale Securities	4,816		4,816		28,188
Integra Resources Corp. [Member] | Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	5,000		5,000		5,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0		0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	3,023		3,023		355
Available-for-sale Securities	8,023		8,023		5,355
Rockhaven Resources, Ltd. [Member] | Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	2,064		2,064		2,064
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(398)		(398)		(376)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0		0		0
Available-for-sale Securities	1,666		1,666		1,688
Other Investments [Member] | Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	448		448		1,304
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0		0		(889)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	133		133		0
Available-for-sale Securities	581		581		415
Level 3   | Equity and debt securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities					$ 0
Available-for-sale Securities | Level 3   | Equity and debt securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities	$ 0		$ 0

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