Income and Mining Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Examination [Line Items]
Income (loss) before income and mining taxes	$ 15,102	$ (22,479)	$ 10,542	$ (72,636)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	54,455	8,260	53,118	8,451
United States - Alternative Minimum tax [Member]
Income Tax Examination [Line Items]
United States	3,286	(16,168)	(5,956)	(46,640)
Income tax provision from continuing operations
Federal tax expense (benefit)	10,712	(1,080)	8,370	1,123
ARGENTINA
Income Tax Examination [Line Items]
Foreign	(301)	(731)	3,137	(2,083)
Income tax provision from continuing operations
Foreign tax expense (benefit)	67	(2)	(183)	(3)
Mexico [Member]
Income Tax Examination [Line Items]
Foreign	3,020	(1,412)	(1,136)	(16,666)
Income tax provision from continuing operations
Foreign tax expense (benefit)	37,821	11,951	42,155	11,234
BOLIVIA
Income Tax Examination [Line Items]
Foreign	4,325	(4,483)	10,388	(8,081)
Income tax provision from continuing operations
Foreign tax expense (benefit)	5,904	(1,029)	5,182	(2,240)
Other Countries [Member]
Income Tax Examination [Line Items]
Foreign	4,772	315	4,109	834
Income tax provision from continuing operations
Foreign tax expense (benefit)	$ (49)	$ (1,580)	$ (2,406)	$ (1,663)