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INVESTMENT IN MINERA SANTA CRUZ S.A. (''MSC'') - SAN JOSE MINE (Details 4) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 55,463	$ 39,701
Total assets	506,615	522,958	$ 796,270
Current liabilities	28,468	24,081
Total liabilities	72,945	$ 81,743
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	97,900
Total assets	509,500
Current liabilities	46,000
Total liabilities	154,000
MSC | Current Period Values Excluding Fair Value Increments And Impairment Charge
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	96,500
Total assets	292,700
Current liabilities	48,400
Total liabilities	$ 85,700

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