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INVESTMENT IN MINERA SANTA CRUZ S.A. (''MSC'') - SAN JOSE MINE (Details 3) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2013 MSC USD ($)	Dec. 31, 2013 MSC USD ($)	Dec. 31, 2012 MSC USD ($)	Dec. 31, 2013 MSC Subsequent event USD ($)	Dec. 31, 2013 MSC Subsequent event ARS
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 46,771	$ 91,918			$ 113,100
Total assets	923,066	1,150,937	310,355		561,700
Current liabilities	11,189	25,195			66,700
Total liabilities	176,299	261,346			178,700
Impairment of investment in Minera Santa Cruz S.A.	95,878			95,900	95,878
Dividend received					$ 1,826	$ 9,770	$ 3,300	29,400