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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Assets and Liabilities Associated with MSC (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 74,803	$ 54,443
Total assets	499,835	475,085	$ 504,750
Current liabilities	19,231	22,039
Total liabilities	52,623	$ 56,793
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	112,400
Total assets	481,200
Current liabilities	54,200
Total liabilities	138,900
MSC | Current Period Values Excluding Fair Value Increments And Impairment Charge
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	111,600
Total assets	296,500
Current liabilities	58,200
Total liabilities	$ 87,600

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