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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Changes in Company's Investment in MSC (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Change in the investment in MSC
Investment in MSC, beginning of period			$ 127,814
Income tax recovery	$ (2,192)	$ (1,613)	(2,575)	$ (4,891)
Dividend distribution received			(4,045)	(9,360)
Investment in MSC, end of period	116,994		116,994		$ 127,814
MSC
Change in the investment in MSC
Investment in MSC, beginning of period			127,814	150,064	150,064
Attributable net loss from MSC	803	(5,164)	(2,339)	(8,506)	(10,065)
Amortization of fair value increments	(2,551)	(2,537)	(6,923)	(7,135)	(9,730)
Income tax recovery	1,420	$ 2,728	2,487	$ 8,191	7,930
Dividend distribution received			(4,045)		(10,385)
Investment in MSC, end of period	$ 116,994		$ 116,994		$ 127,814

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of the period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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