Income and Mining Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Examination [Line Items]
Income (loss) before income and mining taxes	$ (2,420)	$ 15,102	$ 14,236	$ 10,542
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(14,232)	54,455	(23,180)	53,118
UNITED STATES
Income Tax Examination [Line Items]
United States	(6,008)	3,286	8,213	(5,956)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(2,362)	10,712	(2,739)	8,370
ARGENTINA
Income Tax Examination [Line Items]
Foreign	738	(301)	281	3,137
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(366)	67	1,704	(183)
Mexico
Income Tax Examination [Line Items]
Foreign	3,210	3,020	9,665	(1,136)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(9,057)	37,821	(23,745)	42,155
BOLIVIA
Income Tax Examination [Line Items]
Foreign	(5,029)	4,325	(6,559)	10,388
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(518)	5,904	(304)	5,182
Other Countries
Income Tax Examination [Line Items]
Foreign	4,669	4,772	2,636	4,109
Income tax provision from continuing operations
Income and mining tax benefit (expense)	$ (1,929)	$ (49)	$ 1,904	$ (2,406)