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INVESTMENT IN MINERA SANTA CRUZ S.A. (''MSC'') - SAN JOSE MINE (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Income tax recovery	$ (8,714)	$ (12,157)	$ (52,705)	$ (31,025)
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization)	(4,441)	2,040	150	252
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	38,263	69,663	148,386	182,031
Production costs applicable to sales	(36,136)	(44,964)	(117,620)	(139,373)
(Loss) income from operations before extraordinary items	(5,488)	5,424	304	7,988
Net (loss) income	(5,488)	5,424	304	7,988
Ownership interest (as a percent)	49.00%	49.00%	49.00%	49.00%
Net (loss) income	(2,689)	2,658	149	3,914	2,126
Amortization of fair value increments	(3,522)	(3,579)	(9,652)	(15,582)	(18,425)
Income tax recovery	1,770	2,961	9,653	11,920	17,145
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization)	$ (4,441)	$ 2,040	$ 150	$ 252

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