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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Summary of cumulative net gain (loss) by component, net of tax, within other comprehensive income
Changes in the components of accumulated other comprehensive income, including amounts reclassified out, for 2014, 2013 and 2012, and the balances in accumulated other comprehensive income as of December 31, 2014, 2013, and 2012 are as follows:
 
Gains and Losses
On Cash Flow Hedges
 
Pension and Post- Employment Benefits
 
Foreign Currency Translation
 
 
(Thousands)
Foreign Currency
 
Precious Metals
 
Total
Total
Accumulated other comprehensive income as of December 31, 2011
 
 
 
 
 
 
 
 
 
 
 
Gross
$
1,399

 
$
51

 
$
1,450

 
$
(105,236
)
 
$
4,947

 
$
(98,839
)
Deferred tax expense (benefit)
(913
)
 
18

 
(895
)
 
(25,729
)
 
—

 
(26,624
)
Net
$
2,312

 
$
33

 
$
2,345

 
$
(79,507
)
 
$
4,947

 
$
(72,215
)
2012 activity
 
 
 
 
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications
$
693

 
$
(552
)
 
$
141

 
$
(27,662
)
 
$
(870
)
 
$
(28,391
)
Amounts reclassified from accumulated other comprehensive income
(1,839
)
 
598

 
(1,241
)
 
5,357

 
—

 
4,116

Net current period other comprehensive income (loss) before tax
(1,146
)
 
46


(1,100
)
 
(22,305
)
 
(870
)
 
(24,275
)
Deferred taxes on current period activity
(401
)
 
16

 
(385
)
 
(7,676
)
 
—

 
(8,061
)
2012 other comprehensive income (loss) after tax
(745
)
 
30

 
(715
)
 
(14,629
)
 
(870
)
 
(16,214
)
Accumulated other comprehensive income as of December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Gross
253

 
97

 
350

 
(127,541
)
 
4,077

 
(123,114
)
Deferred tax expense (benefit)
(1,314
)
 
34

 
(1,280
)
 
(33,405
)
 
—

 
(34,685
)
Net
$
1,567


$
63

 
$
1,630

 
$
(94,136
)
 
$
4,077

 
$
(88,429
)
2013 activity











Other comprehensive income (loss) before reclassifications
$
618


$
4


$
622


$
42,553


$
(3,790
)

$
39,385

Amounts reclassified from accumulated other comprehensive income
(958
)

(120
)

(1,078
)

7,687


—


6,609

Net current period other comprehensive income (loss) before tax
(340
)

(116
)

(456
)

50,240


(3,790
)

45,994

Deferred taxes on current period activity
(119
)

(41
)

(160
)

17,613


—


17,453

2013 other comprehensive income (loss) after tax
(221
)

(75
)

(296
)

32,627


(3,790
)

28,541

Accumulated other comprehensive income as of December 31, 2013











Gross
(87
)

(19
)

(106
)

(77,301
)

287


(77,120
)
Deferred tax (benefit)
(1,433
)

(7
)

(1,440
)

(15,792
)

—


(17,232
)
Net
$
1,346


$
(12
)

$
1,334


$
(61,509
)

$
287


$
(59,888
)
2014 activity
 
 
 
 
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications
$
3,456

 
$
19

 
$
3,475

 
$
(35,109
)
 
$
(4,440
)
 
$
(36,074
)
Amounts reclassified from accumulated other comprehensive income
87

 
—

 
87

 
3,330

 
—

 
3,417

Net current period other comprehensive income (loss) before tax
3,543

 
19

 
3,562

 
(31,779
)
 
(4,440
)
 
(32,657
)
Deferred taxes on current period activity
1,311

 
7

 
1,318

 
(11,626
)
 
—

 
(10,308
)
2014 other comprehensive income (loss) after tax
2,232

 
12

 
2,244

 
(20,153
)
 
(4,440
)
 
(22,349
)
Accumulated other comprehensive income as of December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Gross
3,456

 
—

 
3,456

 
(109,080
)
 
(4,153
)
 
(109,777
)
Deferred tax (benefit)
(122
)
 
—

 
(122
)
 
(27,418
)
 
—

 
(27,540
)
Net
$
3,578

 
$
—

 
$
3,578

 
$
(81,662
)
 
$
(4,153
)
 
$
(82,237
)