Income and Mining Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Examination [Line Items]
Income (loss) before income and mining taxes	$ (18,290)	$ (33,219)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(2,106)	(68)
United States - Alternative Minimum tax [Member]
Income Tax Examination [Line Items]
United States	(9,361)	(20,707)
Income tax provision from continuing operations
Federal tax expense (benefit)	(532)	1,886
Argentina [Member]
Income Tax Examination [Line Items]
Foreign	(1,015)	(696)
Income tax provision from continuing operations
Foreign tax expense (benefit)	1,543	(1)
Mexico [Member]
Income Tax Examination [Line Items]
Foreign	(7,509)	(9,672)
Income tax provision from continuing operations
Foreign tax expense (benefit)	17	(1,264)
BOLIVIA
Income Tax Examination [Line Items]
Foreign	2,047	(2,379)
Income tax provision from continuing operations
Foreign tax expense (benefit)	(1,570)	(1,407)
Other Countries [Member]
Income Tax Examination [Line Items]
Foreign	(2,452)	235
Income tax provision from continuing operations
Foreign tax expense (benefit)	$ (1,564)	$ 718