Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income tax provision from continuing operations
Income tax benefit (provision) from continuing operations	$ (23,862)	$ (21,402)	$ (39,298)	$ (34,341)
Income Taxes (Textual) [Abstract]
Income tax benefit (Provision)	(23,862)	(21,402)	(39,298)	(34,341)
United States - Foreign Withholding [Member]
Income tax provision from continuing operations
Federal tax expense (benefit)	(388)	(2,202)	(3,525)	(958)
ARGENTINA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(38)	(15)	(239)	83
AUSTRALIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(495)	(700)	(1,206)	(1,118)
MEXICO
Income tax provision from continuing operations
Foreign tax expense (benefit)	(12,052)	(6,376)	(15,750)	(10,202)
Income Taxes (Textual) [Abstract]
Net operating loss carryforward period	10 years
BOLIVIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	$ (10,889)	$ (12,109)	$ (18,578)	$ (22,146)