Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Deferred:
Income tax benefit (provision) from continuing operations	$ (15,436)	$ (12,939)
Income Taxes (Textual) [Abstract]
Income tax benefit (Provision)	(15,436)	(12,939)
United States - Alternative Minimum tax [Member]
Income tax provision from continuing operations
Federal tax expense (benefit)	0	1,938
United States - Foreign Withholding [Member]
Income tax provision from continuing operations
Federal tax expense (benefit)	(17)	(78)
UNITED STATES
Deferred:
Federal tax expense (benefit)	(3,120)	(616)
ARGENTINA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(201)	98
AUSTRALIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(371)	101
Deferred:
Foreign tax expense (benefit)	(340)	(519)
MEXICO
Income tax provision from continuing operations
Foreign tax expense (benefit)	(154)	(50)
Deferred:
Foreign tax expense (benefit)	(3,544)	(3,776)
Income Taxes (Textual) [Abstract]
Net operating loss carryforward period	10 years
BOLIVIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(7,015)	(9,079)
Deferred:
Foreign tax expense (benefit)	$ (674)	$ (958)