Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Examination [Line Items]
Deferred Income Tax Expense (Benefit)			$ 2.1
Income tax provision from continuing operations
Income tax benefit (provision) from continuing operations	(17,475,000)	(27,606,000)	(56,773,000)	(61,947,000)
Income Taxes (Textual) [Abstract]
Income tax benefit (Provision)	(17,475,000)	(27,606,000)	(56,773,000)	(61,947,000)
Income Tax Reconciliation, Prior Year Income Taxes	1.4		10.3
United States - Foreign Withholding [Member]
Income tax provision from continuing operations
Federal tax expense (benefit)	(465,000)	1,300,000	(3,990,000)	342,000
ARGENTINA
Income tax provision from continuing operations
Foreign tax expense (benefit)	1,232,000	(23,000)	993,000	60,000
AUSTRALIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(545,000)	(858,000)	(1,751,000)	(1,976,000)
MEXICO
Income tax provision from continuing operations
Foreign tax expense (benefit)	5,409,000	(2,963,000)	(10,341,000)	(13,165,000)
Income Taxes (Textual) [Abstract]
Net operating loss carryforward period	10 years
BOLIVIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	$ (23,106,000)	$ (25,062,000)	$ (41,684,000)	$ (47,208,000)