Income and Mining Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Contingency [Line Items]
Foreign Exchange Income Tax Expense (Benefit)	$ 5,600
Income Tax Expense (Benefit)	11,046	$ 2,106
Unrecognized Tax Benefits	18,700		$ 19,600
Income Tax Examination, Penalties and Interest Expense	8,700		$ 8,700
Minimum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	2,500
Maximum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	3,500
Joaquin Project - Argentina [Member]
Income Tax Contingency [Line Items]
Income Tax Expense (Benefit)	$ 1,800