Other, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ (4,346)	$ (9,069)	$ 1,281
Gain (loss) on sale of assets and investments	(714)	19	(1,037)
Write-Down of Manquiri Consideration	133	(18,599)	0
Write-Down of RMC Receivable	(1,040)	(6,536)	0
Gain on sale of the Joaquin project	0	0	21,138
Gain on repurchase of the Rochester royalty obligation	0	0	2,332
Mexico Inflation Adjustment	0	1,939	0
Interest Income, Other	199	1,776	0
Gain (loss) on the sale of the Endeavor stream and other royalties	0	0	1,036
Other than Temporary Impairment Losses, Investments	0	0	(426)
Other	2,575	5,765	2,319
Other, net	$ (3,193)	$ (24,705)	$ 26,643