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Income and Mining Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The following table summarizes the components of Income and mining tax (expense) benefit for the three and six months ended June 30, 2018 and 2017 by significant jurisdiction:

 
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
In thousands
Income (loss) before tax
Tax (expense) benefit
 
Income (loss) before tax
Tax (expense) benefit
 
Income (loss) before tax
Tax (expense) benefit
 
Income (loss) before tax
Tax (expense) benefit
United States
$
(11,334
)
$
(2,309
)
 
$
(6,563
)
$
2,315

 
$
(10,147
)
$
(1,792
)
 
$
14,090

$
213

Argentina
(180
)
(108
)
 
(129
)
945

 
74

(97
)
 
(457
)
2,070

Canada
(2,155
)
1,199

 
6

940

 
(3,909
)
2,044

 
8

908

Mexico
20,542

(2,499
)
 
(2,195
)
(4,766
)
 
33,669

(15,821
)
 
6,455

(14,689
)
Other jurisdictions
(226
)
—


(2,241
)
1,693


(400
)
—


(2,041
)
1,747

 
$
6,647

$
(3,717
)
 
$
(11,122
)
$
1,127

 
$
19,287

$
(15,666
)
 
$
18,055

$
(9,751
)