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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2012
Income Tax Disclosure [Abstract]  
Income tax provision from continuing operations
The following table summarizes the components of the Company’s income tax provision from continuing operations for the three months ended March 31, 2012 and 2011 (in thousands): 
 
Three months ended
March 31,
 
2012
 
2011
Current:
 
 
 
United States - Alternative minimum tax
$
—

 
$
1,938

United States - Foreign withholding
(17
)
 
(78
)
Argentina
(201
)
 
98

Australia
(371
)
 
101

Mexico
(154
)
 
(50
)
Bolivia
(7,015
)
 
(9,079
)
Deferred:
 
 
 
United States
(3,120
)
 
(616
)
Australia
(340
)
 
(519
)
Mexico
(3,544
)
 
(3,776
)
Bolivia
(674
)
 
(958
)
Income tax provision from continuing operations
$
(15,436
)
 
$
(12,939
)