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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Summary of Other Comprehensive Income (Loss)
The other comprehensive income (loss) consists of the following components:
 
Year Ended December 31, 2017
 
Before-Tax
 
Income
 
After-Tax
(in thousands)
Amount
 
Tax
 
Amount
Foreign currency translation adjustments:
 
 
 
 
 
Translation adjustments arising during the year
$
33,175

 
$
—

 
$
33,175

Adjustment for sale of a business with foreign operations
137

 
—

 
137

 
33,312

 
—

 
33,312

Unrealized gains on available-for-sale securities:
 
 
 
 
 
Unrealized gains for the year
112,086

 
(44,834
)
 
67,252

Pension and other postretirement plans:
 
 
 
 
 
Actuarial gain
179,674

 
(48,511
)
 
131,163

Prior service cost
(75
)
 
20

 
(55
)
Amortization of net actuarial gain included in net income
(6,527
)
 
2,612

 
(3,915
)
Amortization of net prior service cost included in net income
477

 
(191
)
 
286

 
173,549

 
(46,070
)
 
127,479

Cash flow hedge:
 
 
 
 
 
Gain for the year
112

 
(19
)
 
93

Other Comprehensive Income
$
319,059

 
$
(90,923
)
 
$
228,136

 
Year Ended December 31, 2016
 
Before-Tax
 
Income
 
After-Tax
(in thousands)
Amount
 
Tax
 
Amount
Foreign currency translation adjustments:
 
 
 
 
 
Translation adjustments arising during the year
$
(22,149
)
 
$
—

 
$
(22,149
)
Unrealized gains on available-for-sale securities:
 
 
 
 
 
Unrealized gains for the year
55,507

 
(22,203
)
 
33,304

Reclassification adjustment for net realized loss on sale of available-for-sale securities included in net income
1,879

 
(752
)
 
1,127

 
57,386

 
(22,955
)
 
34,431

Pension and other postretirement plans:
 
 
 
 
 
Actuarial loss
(133,915
)
 
53,566

 
(80,349
)
Amortization of net actuarial loss included in net income
1,157

 
(463
)
 
694

Amortization of net prior service cost included in net income
419

 
(167
)
 
252

Curtailments and settlements included in net income
(17,993
)
 
7,197

 
(10,796
)
 
(150,332
)
 
60,133

 
(90,199
)
Cash flow hedge:
 
 
 
 
 
Loss for the year
(334
)
 
57

 
(277
)
Other Comprehensive Loss
$
(115,429
)
 
$
37,235

 
$
(78,194
)
 
Year Ended December 31, 2015
 
Before-Tax
 
Income
 
After-Tax
(in thousands)
Amount
 
Tax
 
Amount
Foreign currency translation adjustments:
 
 
 
 
 
Translation adjustments arising during the year
$
(18,898
)
 
$
—

 
$
(18,898
)
Adjustment for sales of businesses with foreign operations
5,501

 
—

 
5,501

  
(13,397
)
 
—

 
(13,397
)
Unrealized gains on available-for-sale securities:
 
 
 
 
 
Unrealized gains for the year
10,620

 
(4,248
)
 
6,372

Reclassification adjustment for realized gain on sale of available-for-sale securities included in net income
(4
)
 
2

 
(2
)
 
10,616

 
(4,246
)
 
6,370

Pension and other postretirement plans:
 
 
 
 
 
Actuarial loss
(211,054
)
 
84,421

 
(126,633
)
Amortization of net actuarial gain included in net income
(9,906
)
 
3,962

 
(5,944
)
Amortization of net prior service cost included in net income
275

 
(110
)
 
165

Curtailments and settlements included in net income
51

 
(21
)
 
30

Curtailments and settlements included in distribution to Cable ONE
834

 
(333
)
 
501

 
(219,800
)
 
87,919

 
(131,881
)
Cash flow hedge:
 
 
 
 
 
Gain for the year
179

 
(71
)
 
108

Other Comprehensive Loss
$
(222,402
)
 
$
83,602

 
$
(138,800
)
Summary of Changes in Accumulated Other Comprehensive Income (Loss)
The accumulated balances related to each component of other comprehensive income (loss) are as follows:
(in thousands, net of taxes)
Cumulative
Foreign
Currency
Translation
Adjustment
 
Unrealized Gain
on Available-for-
Sale Securities
 
Unrealized Gain
on Pensions
and Other
Postretirement
Plans
 
Cash Flow
Hedge
 
Accumulated
Other
Comprehensive
Income
As of December 31, 2015
$
(4,849
)
 
$
58,500

 
$
261,029

 
$
—

 
$
314,680

Other comprehensive (loss) income before reclassifications
(22,149
)
 
33,304

 
(80,349
)
 
(290
)
 
(69,484
)
Net amount reclassified from accumulated other comprehensive income
—

 
1,127

 
(9,850
)
 
13

 
(8,710
)
Net other comprehensive (loss) income
(22,149
)
 
34,431

 
(90,199
)
 
(277
)
 
(78,194
)
As of December 31, 2016
(26,998
)
 
92,931

 
170,830

 
(277
)
 
236,486

Other comprehensive income (loss) before reclassifications
33,175

 
67,252

 
131,108

 
(29
)
 
231,506

Net amount reclassified from accumulated other comprehensive income
137

 
—

 
(3,629
)
 
122

 
(3,370
)
Net other comprehensive income
33,312

 
67,252

 
127,479

 
93

 
228,136

Reclassification of stranded tax effects to retained earnings as a result of tax reform
—

 
34,706

 
36,227

 
—

 
70,933

As of December 31, 2017
$
6,314

 
$
194,889

 
$
334,536

 
$
(184
)
 
$
535,555
Summary of Amounts and Line Items of Reclassifications out of Accumulated Other Comprehensive Income (Loss)
The amounts and line items of reclassifications out of Accumulated Other Comprehensive Income are as follows:
 
Year Ended December 31
 
Affected Line Item in the Consolidated Statement of Operations
(in thousands)
2017
 
2016
 
2015
 
Foreign Currency Translation Adjustments:
 
 
 
 
 
 
 
Adjustment for sales of businesses with foreign operations
$
137

 
$
—

 
$
5,501

 
Other income (expense), net
Unrealized Gains on Available-for-Sale Securities:
 
 
 
 
 
 
 
Realized loss (gain) for the year
—

 
1,879

 
(4
)
 
Other income (expense), net
 
—

 
(752
)
 
2

 
(Benefit from) provision for income taxes
 
—

 
1,127

 
(2
)
 
Net of tax
Pension and Other Postretirement Plans:
 
 
 
 
 
 
 
Amortization of net actuarial (gain) loss
(6,527
)
 
1,157

 
(9,906
)
 
(1)
Amortization of net prior service cost
477

 
419

 
275

 
(1)
Curtailment (gains) losses
—

 
(17,993
)
 
51

 
(1)
 
(6,050
)
 
(16,417
)
 
(9,580
)
 
Before tax
 
2,421

 
6,567

 
3,831

 
(Benefit from) provision for income taxes
 
(3,629
)
 
(9,850
)
 
(5,749
)
 
Net of tax
Cash Flow Hedge
 
 
 
 
 
 
 
 
152

 
16

 
132

 
Interest expense
 
(30
)
 
(3
)
 
(53
)
 
(Benefit from) provision for income taxes
 
122

 
13

 
79

 
Net of tax
Total reclassification for the year
$
(3,370
)
 
$
(8,710
)
 
$
(171
)
 
Net of tax
____________
(1)
These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 15)