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Income and Mining Taxes (Tables)
 6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The following table summarizes the components of the Company's income and mining tax (expense) benefit for the three and six months ended June 30, 2014 and 2013 by significant location:
 
Three months ended June 30,
 
Six months ended June 30,
 
2014

2013
 
2014
 
2013
(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
$
(31,370
)
$
(146
)

$
(67,824
)
$
(1,329
)
 
$
(60,214
)
$
(292
)
 
$
(61,896
)
$
(4,541
)
Argentina
(688
)
(349
)

(2,989
)
(117
)
 
(2,892
)
4,083

 
(6,981
)
(44
)
Mexico
(12,710
)
107


47,214

(15,798
)
 
(28,716
)
3,828

 
58,756

(19,471
)
Bolivia
3,957

(2,205
)

12,122

(4,556
)
 
8,649

(4,969
)
 
21,628

(8,884
)
Other jurisdictions
311

(28
)
 
110

(1,873
)
 
793

(582
)
 
641

(1,978
)

$
(40,500
)
$
(2,621
)
 
$
(11,367
)
$
(23,673
)
 
$
(82,380
)
$
2,068

 
$
12,148

$
(34,918
)