Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income tax provision from continuing operations
Income tax benefit (provision) from continuing operations	$ (10,520,000)	$ (15,436,000)
Income Taxes (Textual) [Abstract]
Income tax benefit (Provision)	(10,520,000)	(15,436,000)
Income Tax Reconciliation, Prior Year Income Taxes	1,500,000
United States - Foreign Withholding [Member]
Income tax provision from continuing operations
Federal tax expense (benefit)	(2,487,000)	(3,137,000)
ARGENTINA
Income tax provision from continuing operations
Foreign tax expense (benefit)	73,000	(201,000)
AUSTRALIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(105,000)	(711,000)
MEXICO
Income tax provision from continuing operations
Foreign tax expense (benefit)	(3,673,000)	(3,698,000)
Income Taxes (Textual) [Abstract]
Net operating loss carryforward period	10 years
BOLIVIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	$ (4,328,000)	$ (7,689,000)