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Income and Mining Taxes
 3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]  
INCOME TAXES
INCOME AND MINING TAXES
For the three months ended March 31, 2014 and 2013, the Company reported an income and mining tax benefit of $4.7 million and an income and mining tax expense of $11.2 million, respectively.
The following table summarizes the components of the Company's income and mining (expense) benefit:
 
Three months ended March 31,
(in thousands)
2014

2013
United States
$
(146
)

$
(3,212
)
Argentina
4,432


73

Australia
(303
)

(105
)
Mexico
3,721


(3,673
)
Bolivia
(2,764
)

(4,328
)
Canada
(251
)

—

Income tax (expense) benefit
$
4,689


$
(11,245
)


The income tax provision for the three months ended March 31, 2014 varies from the statutory rate primarily due to full valuation allowance positions in certain jurisdictions, foreign exchange rate differences, and differences in tax rates for the for Company’s foreign operations.

The Company has U.S. net operating loss carryforwards which expire in 2019 through 2033. Net operating losses in foreign countries have an indefinite carryforward period, except in Mexico where net operating loss carryforwards are limited to ten years.