Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred:
Income tax provision from continuing operations	$ 158,116	$ (70,807)	$ (114,746)
Components of loss from continuing operations before income taxes
United States	(242,562)	(3,443)	(38,372)
Foreign	(566,117)	122,927	246,617
Income before income taxes	(808,679)	119,484	208,245
United States - Alternative minimum tax [Member]
Current:
Federal tax expense (benefit)	4	(257)	2,015
United States - State Mining Taxes [Member]
Current:
Federal tax expense (benefit)	(714)	(2,195)	(409)
United States - Foreign withholding tax [Member]
Current:
Federal tax expense (benefit)	397	(736)	(842)
Argentina [Member]
Current:
Foreign tax expense (benefit)	(137)	976	(1,219)
Deferred:
Foreign tax expense (benefit)	8,062	0	0
Australia [Member]
Current:
Foreign tax expense (benefit)	(914)	(1,760)	(1,755)
Deferred:
Foreign tax expense (benefit)	(2)	(223)	(661)
Mexico [Member]
Current:
Foreign tax expense (benefit)	(9,046)	(7,814)	(1,084)
Deferred:
Foreign tax expense (benefit)	94,851	(10,579)	(28,022)
Bolivia [Member]
Current:
Foreign tax expense (benefit)	(6,716)	(43,546)	(59,660)
Deferred:
Foreign tax expense (benefit)	(4,222)	(1,087)	(207)
Canada [Member]
Current:
Foreign tax expense (benefit)	(1,936)	0	0
United States [Member]
Deferred:
Federal tax expense (benefit)	$ 78,489	$ (3,586)	$ (22,902)