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Income Taxes (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2012 and 2011 (in thousands): 
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2012
 
2011
 
2012
 
2011
United States
$
(465
)
 
$
1,300

 
$
(3,990
)
 
$
342

Argentina
1,232

 
(23
)
 
993

 
60

Australia
(545
)
 
(858
)
 
(1,751
)
 
(1,976
)
Mexico
5,409

 
(2,963
)
 
(10,341
)
 
(13,165
)
Bolivia
(23,106
)
 
(25,062
)
 
(41,684
)
 
(47,208
)
Income tax provision from continuing operations
$
(17,475
)
 
$
(27,606
)
 
$
(56,773
)
 
$
(61,947
)