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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2012 and 2011 (in thousands): 
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2012
 
2011
 
2012
 
2011
United States
$
(388
)
 
$
(2,202
)
 
$
(3,525
)
 
$
(958
)
Argentina
(38
)
 
(15
)
 
(239
)
 
83

Australia
(495
)
 
(700
)
 
(1,206
)
 
(1,118
)
Mexico
(12,052
)
 
(6,376
)
 
(15,750
)
 
(10,202
)
Bolivia
(10,889
)
 
(12,109
)
 
(18,578
)
 
(22,146
)
Income tax provision from continuing operations
$
(23,862
)
 
$
(21,402
)
 
$
(39,298
)
 
$
(34,341
)