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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
Changes in Accumulated other comprehensive loss (AOCL) for the years ended December 31, were as follows (in thousands):  
 
2019
 
Foreign currency translation adjustments
 
Marketable securities
 
Derivative financial instruments
 
Pension and postretirement benefit plans
 
Total
Balance, beginning of period
$
(49,608
)
 
$
—

 
$
1,785

 
$
(581,861
)
 
$
(629,684
)
Other comprehensive income, before reclassifications
9,229

 
—

 
6,477

 
90,071

 
105,777

Income tax expense
(434
)
 
—

 
(1,541
)
 
(21,149
)
 
(23,124
)
 
8,795

 
—

 
4,936

 
68,922

 
82,653

Reclassifications:
 
 
 
 
 
 
 
 
 
Net gain on derivative instruments
—

 
—

 
(27,732
)
 
—

 
(27,732
)
Prior service credits(a)
—

 
—

 
—

 
(4,311
)
 
(4,311
)
Actuarial losses(a)
—

 
—

 
—

 
44,788

 
44,788

Curtailment and settlement losses(a)
—

 
—

 
—

 
543

 
543

Reclassifications before tax
—

 
—

 
(27,732
)
 
41,020

 
13,288

Income tax benefit (expense)
—

 
—

 
6,425

 
(9,631
)
 
(3,206
)
 
—

 
—

 
(21,307
)
 
31,389

 
10,082

Other comprehensive income (loss)
8,795

 
—

 
(16,371
)
 
100,311

 
92,735

Balance, end of period
$
(40,813
)
 
$
—

 
$
(14,586
)
 
$
(481,550
)
 
$
(536,949
)

 
2018
 
Foreign currency translation adjustments
 
Marketable securities
 
Derivative financial instruments
 
Pension and postretirement benefit plans
 
Total
Balance, beginning of period
$
(21,852
)
 
$
—

 
$
(17,254
)
 
$
(460,943
)
 
$
(500,049
)
Other comprehensive (loss) income, before reclassifications
(28,212
)
 
—

 
35,686

 
(84,725
)
 
(77,251
)
Income tax benefit (expense)
3,202

 
—

 
(8,455
)
 
19,893

 
14,640

 
(25,010
)
 
—

 
27,231

 
(64,832
)
 
(62,611
)
Reclassifications:
 
 
 
 
 
 
 
 
 
Net gain on derivative instruments
—

 
—

 
(9,466
)
 
—

 
(9,466
)
Prior service credits(a)
—

 
—

 
—

 
(2,262
)
 
(2,262
)
Actuarial losses(a)
—

 
—

 
—

 
66,590

 
66,590

Curtailment and settlement gains(a)
—

 
—

 
—

 
(886
)
 
(886
)
Reclassifications before tax
—

 
—

 
(9,466
)
 
63,442

 
53,976

Income tax benefit (expense)
—

 
—

 
2,244

 
(14,896
)
 
(12,652
)
 
—

 
—

 
(7,222
)
 
48,546

 
41,324

Other comprehensive (loss) income
(25,010
)
 
—

 
20,009

 
(16,286
)
 
(21,287
)
Reclassification of certain tax effects
(2,746
)
 
—

 
(970
)
 
(104,632
)
 
(108,348
)
Balance, end of period
$
(49,608
)
 
$
—

 
$
1,785

 
$
(581,861
)
 
$
(629,684
)

 
2017
 
Foreign currency translation adjustments
 
Marketable securities
 
Derivative financial instruments
 
Pension and postretirement benefit plans
 
Total
Balance, beginning of period
$
(68,132
)
 
$
(1,194
)
 
$
12,524

 
$
(508,579
)
 
$
(565,381
)
Other comprehensive income (loss), before reclassifications
52,145

 
1,896

 
(54,929
)
 
24,321

 
23,433

Income tax (expense) benefit
(5,865
)
 
(702
)
 
20,338

 
(5,711
)
 
8,060

 
46,280

 
1,194

 
(34,591
)
 
18,610

 
31,493

Reclassifications:
 
 
 
 
 
 
 
 
 
Net loss on derivative instruments
—

 
—

 
7,644

 
—

 
7,644

Prior service credits(a)
—

 
—

 
—

 
(1,153
)
 
(1,153
)
Actuarial losses(a)
—

 
—

 
—

 
47,254

 
47,254

Reclassifications before tax
—

 
—

 
7,644

 
46,101

 
53,745

Income tax expense
—

 
—

 
(2,831
)
 
(17,075
)
 
(19,906
)
 
—

 
—

 
4,813

 
29,026

 
33,839

Other comprehensive income (loss)
46,280

 
1,194

 
(29,778
)
 
47,636

 
65,332

Balance, end of period
$
(21,852
)
 
$
—

 
$
(17,254
)
 
$
(460,943
)
 
$
(500,049
)
(a)
Amounts reclassified are included in the computation of net periodic benefit cost, discussed further in Note 15.