Other, Net - Summary of Other Non-Operating (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ (2,245)		$ (4,346)		$ (9,069)
Gain (loss) on sale of assets and investments	(2,849)		(714)		19
Gold zero cost collars novation fee	(3,819)		0		0
Gain (loss) on sale of Manquiri consideration	365	[1]	133	[1]	(18,599)
Mexico Inflation Adjustment	0		0		1,939
Gain (loss) on Silvertip consideration	955		0		0
Interest Income, Other	0		198		1,776
Other	1,652		2,576		5,765
Other, net	(5,941)		(3,193)		(24,705)
Write-Down of RMC Receivable	$ 0		$ (1,040)		$ (6,536)

[1] As defined in Note 22 -- Discontinued Operations.