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INVESTMENT IN MINERA SANTA CRUZ S.A. (“MSC”) - SAN JOSÉ MINE - Summary of the operating results from MSC (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 24, 2012
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Income tax recovery	$ (24,560)	$ (107,170)	$ (53,365)
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization)	$ 2,414	$ (5,284)	$ 846
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net sales percentage	100.00%	100.00%	100.00%
Net sales	$ 186,095	$ 213,013	$ 240,723
Production costs applicable to sales	(158,615)	(173,274)	(190,281)
Net (loss) income	$ (5,835)	$ (5,300)	$ 4,338
Ownership interest (as a percent)	49.00%	49.00%	49.00%	49.00%
Net (loss) income	$ (2,859)	$ (2,597)	$ 2,126
Amortization of fair value increments	(10,669)	(13,190)	(18,425)
Income tax recovery	15,942	10,503	17,145
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization)	$ 2,414	$ (5,284)	$ 846

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