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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Summary of Operating Results from MSC (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales	$ 36,383	$ 33,806	$ 51,966	$ 74,847
Other operating expenses	(15,872)	(18,188)	(27,852)	(37,067)
Net (loss) income before tax	(13,515)	(7,520)	(23,533)	(13,869)
Net loss	(13,014)	(5,380)	(23,150)	(10,591)
Income tax recovery	(501)	(2,140)	(383)	(3,278)
(Loss) from investment in MSC, net of amortization	(4,137)	(2,265)	(6,447)	(2,477)
Dividends received				7,200
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net loss	(1,784)	(3,773)	(3,142)	(3,343)	$ (10,065)
Amortization of fair value increments	(2,459)	(2,482)	(4,372)	(4,597)	(9,730)
Income tax recovery	$ 106	3,990	$ 1,067	5,463	$ 7,930
Ownership interest (as a percent)	49.00%		49.00%
(Loss) from investment in MSC, net of amortization	$ (4,137)	(2,265)	$ (6,447)	(2,477)
Dividends received		2,400	2,000
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales	62,597	52,272	108,800	102,934
Production costs applicable to sales	(52,896)	(43,346)	(89,236)	(86,814)
Other operating expenses	(9,440)	(3,553)	(18,843)	(7,612)
Other expenses	(855)	(6,136)	(3,298)	(8,254)
Net (loss) income before tax	(594)	(763)	(2,577)	254
Current and deferred tax expense	(3,049)	(6,937)	(3,838)	(7,076)
Net loss	$ (3,643)	$ (7,700)	$ (6,415)	$ (6,822)
Summarized key financial information (as a percent)			100.00%

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