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Income Taxes
 3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
INCOME TAXES
INCOME TAXES
For the three months ended March 31, 2013, the Company reported an income tax provision of approximately $10.5 million compared to an income tax provision of $15.4 million for the three months ended March 31, 2012.
The following table summarizes the components of the Company’s income tax provision from continuing operations for the three months ended March 31, 2013 and 2012 (in thousands): 
 
Three months ended
March 31,
 
2013
 
2012
 
 
 
 
United States
$
(2,487
)
 
$
(3,137
)
Argentina
73

 
(201
)
Australia
(105
)
 
(711
)
Mexico
(3,673
)
 
(3,698
)
Bolivia
(4,328
)
 
(7,689
)
Income tax provision from continuing operations
$
(10,520
)
 
$
(15,436
)

The income tax provision for the three months ended March 31, 2013 varies from the statutory rate primarily because of differences in tax rates for the Company's foreign operations and changes in valuation allowances for net deferred tax assets, permanent differences and foreign exchange rate differences. The variance is also attributable to an audit of San Bartolomé's 2009 Bolivian tax return, whereby San Bartolomé incurred an additional $1.5 million of tax expense, including interest and penalties related to uncertainty in similar tax positions.
The Company has U.S. net operating loss carryforwards which expire in 2017 through 2031. Net operating losses in foreign countries have an indefinite carryforward period, except in Mexico where net operating loss carryforwards are limited to ten years.