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Income and Mining Taxes
 3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
INCOME TAXES
INCOME AND MINING TAXES
The following table summarizes the components of Income and mining tax (expense) benefit for the three months ended March 31, 2015 and 2014 by significant location:
 
Three months ended March 31,
 
2015
 
2014
In thousands
Income (loss) before tax
Tax (expense) benefit
 
Income (loss) before tax
Tax (expense) benefit
United States
$
(20,707
)
$
1,886

 
$
(28,686
)
$
(146
)
Argentina
(696
)
(1
)
 
(2,204
)
4,432

Mexico
(9,672
)
(1,264
)
 
(16,006
)
3,721

Bolivia
(2,379
)
(1,407
)
 
4,692

(2,764
)
Other jurisdictions
235

718

 
324

(554
)

$
(33,219
)
$
(68
)
 
$
(41,880
)
$
4,689



The income tax provision for the three months ended March 31, 2015 differs from the statutory rate primarily due to (i) a full valuation allowance against the deferred tax assets relating to losses incurred in the United States and certain foreign locations, (ii) the impact of foreign exchange adjustments on deferred tax account balances, reserves for uncertain tax positions, and foreign earnings not considered as permanently reinvested with respect to certain foreign locations, and (iii) differences in foreign tax rates in the Company's foreign locations. In conjunction with these items, the Company's consolidated effective income tax rate is a function of the combined effective tax rates in the jurisdictions in which it operates. Variations in the relative proportions of jurisdictional income and loss result in significant fluctuations in its consolidated effective tax rate.

The Company has U.S. net operating loss carryforwards which expire in 2019 through 2034. Net operating losses in foreign countries have an indefinite carryforward period, except in Mexico where net operating loss carryforwards are limited to ten years.