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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of cumulative net gain (loss) by component, net of tax, within other comprehensive income
The following table summarizes amounts recognized in other comprehensive income (OCI):
  
Pension Benefits
 
Other Benefits
(Thousands)
2019

2018

2017

2019

2018

2017
Change in other comprehensive income
 
 
 
 
 
 
 
 
 
 
 
OCI at beginning of year
$
65,409


$
122,802

 
$
121,329

 
$
(8,976
)

$
(8,020
)
 
$
(9,961
)
Increase (decrease) in OCI:


 
 
 
 


 
 
 
Recognized during year — prior service cost (credit)
(3,811
)

123

 
274

 
1,497


1,497

 
1,497

Recognized during year — net actuarial (losses) gains
(3,304
)

(7,171
)
 
(6,636
)
 
93


—

 
—

Occurring during year — prior service cost
—


—

 
3,804

 
—


—

 
—

Occurring during year — net actuarial losses (gains)
2,062


(8,997
)
 
4,055

 
(2,192
)

(2,453
)
 
444

Other adjustments
(12,212
)

(41,406
)
 
—

 
—


—

 
—

Foreign currency exchange rate changes
(71
)

58

 
(24
)
 
—


—

 
—

OCI at end of year
$
48,073

 
$
65,409

 
$
122,802

 
$
(9,578
)
 
$
(8,976
)
 
$
(8,020
)

Changes in the components of accumulated other comprehensive income, including amounts reclassified out, for 2019, 2018, and 2017, and the balances in accumulated other comprehensive income as of December 31, 2019, 2018, and 2017 are as follows:
 
 
Gains and Losses
On Cash Flow Hedges
 
Pension and Post- Employment Benefits
 
Foreign Currency Translation
 
 
(Thousands)
 
Foreign Currency
 
Precious Metals
 
Copper
 
Total
Total
Balance at December 31, 2016
 
$
1,837

 
$
—

 
$
—

 
$
1,837

 
$
(82,358
)
 
$
(5,660
)
 
$
(86,181
)
Other comprehensive income (loss) before reclassifications
 
(1,180
)
 
(463
)
 
—

 
(1,643
)
 
(8,279
)
 
1,552

 
(8,370
)
Amounts reclassified from accumulated other comprehensive income
 
632

 
208

 
—

 
840

 
4,865

 
—

 
5,705

Other comprehensive income (loss) before tax
 
(548
)
 
(255
)
 
—


(803
)
 
(3,414
)
 
1,552

 
(2,665
)
Deferred taxes on current period activity
 
330

 
(59
)
 
—

 
271

 
13,820

 
—

 
14,091

Other comprehensive income (loss) after tax
 
(878
)
 
(196
)
 
—

 
(1,074
)
 
(17,234
)
 
1,552

 
(16,756
)
Balance at December 31, 2017
 
$
959

 
$
(196
)
 
$
—

 
$
763

 
$
(99,592
)
 
$
(4,108
)
 
$
(102,937
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2017
 
$
959

 
$
(196
)
 
$
—

 
$
763

 
$
(99,592
)
 
$
(4,108
)
 
$
(102,937
)
Other comprehensive income (loss) before reclassifications

(333
)

467

 
(569
)

(435
)

11,396


(484
)

10,477

Amounts reclassified from accumulated other comprehensive income

10


(109
)
 
—


(99
)

46,953


—


46,854

Other comprehensive income (loss) before tax

(323
)

358

 
(569
)

(534
)

58,349


(484
)

57,331

Deferred taxes on current period activity

(627
)

83

 
(128
)

(672
)

13,300


—


12,628

Other comprehensive income (loss) after tax

304


275

 
(441
)

138


45,049


(484
)

44,703

Balance at December 31, 2018

$
1,263


$
79

 
$
(441
)

$
901


$
(54,543
)

$
(4,592
)

$
(58,234
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2018
 
$
1,263

 
$
79

 
$
(441
)
 
$
901

 
$
(54,543
)
 
$
(4,592
)
 
$
(58,234
)
Other comprehensive income (loss) before reclassifications
 
108

 
(1,285
)
 
209

 
(968
)
 
9,085

 
(421
)
 
7,696

Amounts reclassified from accumulated other comprehensive income
 
(29
)
 
595

 
393

 
959

 
8,853

 
—

 
9,812

Other comprehensive income (loss) before tax
 
79

 
(690
)
 
602

 
(9
)
 
17,938

 
(421
)
 
17,508

Deferred taxes on current period activity

 
18

 
(159
)
 
136

 
(5
)
 
4,741

 
—

 
4,736

Other comprehensive income (loss) after tax
 
61

 
(531
)
 
466

 
(4
)
 
13,197

 
(421
)
 
12,772

Balance at December 31, 2019
 
$
1,324

 
$
(452
)
 
$
25

 
$
897

 
$
(41,346
)
 
$
(5,013
)
 
$
(45,462
)