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INVESTMENT IN MINERA SANTA CRUZ S.A. (''MSC'') - SAN JOSE MINE (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Income tax recovery	$ (12,321)	$ (25,034)	$ (13,484)	$ (43,991)
(Loss) income on investment in MSC, net of amortization	$ (2,652)	$ (2,438)	$ (2,323)	$ 4,591
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net sales percentage	100.00%	100.00%	100.00%	100.00%
Net sales	$ 49,858	$ 53,234	$ 95,749	$ 110,123
Production costs applicable to sales	(41,310)	(41,847)	(78,173)	(81,484)
Net (loss) income	$ (3,042)	$ (390)	$ (1,810)	$ 5,792
Ownership interest (as a percent)	49.00%	49.00%	49.00%	49.00%
Net (loss) income	$ (1,491)	$ (191)	$ (887)	$ 2,838	$ (2,597)
Amortization of fair value increments	(3,401)	(3,429)	(6,088)	(6,130)	(13,190)
Income tax recovery	2,240	1,182	4,652	7,883	$ 10,503
(Loss) income on investment in MSC, net of amortization	$ (2,652)	$ (2,438)	$ (2,323)	$ 4,591

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