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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		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Income tax recovery	$ (25,034)	$ (12,405)	$ (43,991)	$ (18,868)
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization)	(2,438)	(1,551)	4,591	(1,788)
Minera Santa Cruz S A [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net sales percentage	100.00%	100.00%	100.00%	100.00%
Net sales	53,234	68,556	110,123	112,369
Production costs applicable to sales	(41,847)	(57,606)	(81,484)	(94,409)
(Loss) income from operations before extraordinary items	(390)	124	5,792	2,564
Net (loss) income	(390)	124	5,792	2,564
Ownership interest (as a percent)	49.00%	49.00%	49.00%	49.00%
Net (loss) income	(191)	61	2,838	1,256	2,126
Amortization of fair value increments	(3,429)	(6,710)	(6,130)	(12,003)	(18,425)
Income tax recovery	1,182	5,098	7,883	8,959	17,145
Income (loss) on investment in Minera Santa Cruz S.A. (net of amortization)	$ (2,438)	$ (1,551)	$ 4,591	$ (1,788)

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