Income and Mining Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Examination [Line Items]
Income (loss) before income and mining taxes	$ 29,709	$ (18,290)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(11,046)	(2,106)
UNITED STATES
Income Tax Examination [Line Items]
United States	20,714	(9,361)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	1,964	532
ARGENTINA
Income Tax Examination [Line Items]
Foreign	(328)	(1,015)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	(1,124)	(1,543)
Mexico
Income Tax Examination [Line Items]
Foreign	8,650	(7,509)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	9,923	(17)
BOLIVIA
Income Tax Examination [Line Items]
Foreign	471	2,047
Income tax provision from continuing operations
Income and mining tax benefit (expense)	31	1,570
Other Countries
Income Tax Examination [Line Items]
Foreign	202	(2,452)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	$ 252	$ 1,564