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Pension and Postretirement Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Defined Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Amounts Recognized in Balance Sheet
The amounts recognized in the Company’s Consolidated Balance Sheets for its defined benefit pension plans are as follows:
 
Pension Plans
 
SERP
 
As of December 31
 
As of December 31
(in thousands)
2016
 
2015
 
2016
 
2015
Noncurrent asset
$
881,593

 
$
979,970

 
$
—

 
$
—

Current liability
—

 
—

 
(5,580
)
 
(5,442
)
Noncurrent liability
—

 
—

 
(100,946
)
 
(99,562
)
Recognized Asset (Liability)
$
881,593

 
$
979,970

 
$
(106,526
)
 
$
(105,004
)
Schedule of Estimated Benefit Payments
At December 31, 2016, future estimated benefit payments, excluding charges for early retirement programs, are as follows:
(in thousands)
Pension Plans
 
SERP
2017
$
68,782

 
$
5,693

2018
$
69,704

 
$
5,820

2019
$
69,465

 
$
6,232

2020
$
69,933

 
$
6,327

2021
$
70,122

 
$
6,429

2022–2026
$
350,228

 
$
34,061
Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (AOCI) includes the following components of unrecognized net periodic cost for the defined benefit plans:
 
Pension Plans
 
SERP
 
As of December 31
 
As of December 31
(in thousands)
2016
 
2015
 
2016
 
2015
Unrecognized actuarial (gain) loss
$
(285,304
)
 
$
(451,076
)
 
$
24,958

 
$
26,497

Unrecognized prior service cost
365

 
662

 
775

 
1,232

Gross Amount
(284,939
)
 
(450,414
)
 
25,733

 
27,729

Deferred tax liability (asset)
113,976

 
180,166

 
(10,293
)
 
(11,091
)
Net Amount
$
(170,963
)
 
$
(270,248
)
 
$
15,440

 
$
16,638
Schedule of Expected Net Periodic Cost to be Recognized in Accumulated Other Comprehensive Income (Loss)
During 2017, the Company expects to recognize the following amortization components of net periodic cost for the defined benefit plans:
 
2017
(in thousands)
Pension Plans
 
SERP
Actuarial (gain) loss recognition
$
(5,161
)
 
$
1,827

Prior service cost recognition
$
156

 
$
457
Defined Benefit Plans [Member] | Periodic Cost [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Assumptions Used
The costs for the Company’s defined benefit pension plans are actuarially determined. Below are the key assumptions utilized to determine periodic cost:
 
Pension Plans
 
SERP
 
Year Ended December 31
 
Year Ended December 31
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Discount rate (1)
4.3%
 
4.4%/4.0%
 
4.8%
 
4.3%
 
4.4%/4.0%
 
4.8%
Expected return on plan assets
6.5%
 
6.5%
 
6.5%
 
—
 
—
 
—
Rate of compensation increase
4.0%
 
4.0%
 
4.0%
 
4.0%
 
4.0%
 
4.0%

____________
(1)
As a result of the spin-off of Cable ONE and the sale of the KHE Campuses business, the Company remeasured the accumulated and projected benefit obligation of the pension plan as of July 1, 2015 and September 3, 2015, respectively. As a result of the spin-off of Cable ONE, the accumulated and projected benefit obligation of the SERP was remeasured as of July 1, 2015. The remeasurement changed the discount rate from 4.0% for the first six months to 4.4% for the second half of 2015.
Defined Benefit Plans [Member] | Benefit Obligation [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Assumptions Used
Key assumptions utilized for determining the benefit obligation are as follows:
 
Pension Plans
 
SERP
 
As of December 31
 
As of December 31
 
2016
 
2015
 
2016
 
2015
Discount rate
4.1%
 
4.3
%
 
4.1%
 
4.3
%
Rate of compensation increase
Graded (5.00%–1.00%)
 
4.0
%
 
Graded (5.00%–1.00%)
 
4.0
%
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Obligation, Asset and Funding Information
The following table sets forth obligation, asset and funding information for the Company’s defined benefit pension plans:
 
Pension Plans
 
As of December 31
(in thousands)
2016
 
2015
Change in Benefit Obligation
 
 
 
Benefit obligation at beginning of year
$
1,254,298

 
$
1,317,480

Service cost
20,461

 
26,294

Interest cost
51,608

 
52,613

Amendments
—

 
4,606

Actuarial gain
(32,203
)
 
(57,834
)
Benefits paid
(60,076
)
 
(85,542
)
Curtailment
—

 
(3,319
)
Settlement
(73,191
)
 
—

Benefit Obligation at End of Year
$
1,160,897

 
$
1,254,298

Change in Plan Assets
 
 
 
Fair value of assets at beginning of year
$
2,234,268

 
$
2,469,968

Actual return on plan assets
(58,511
)
 
(150,158
)
Benefits paid
(60,076
)
 
(85,542
)
Settlement
(73,191
)
 
—

Fair Value of Assets at End of Year
$
2,042,490

 
$
2,234,268

Funded Status
$
881,593

 
$
979,970
Schedule of Net (Benefit) Costs
The total cost (benefit) arising from the Company’s defined benefit pension plans, including the portion included in discontinued operations, consists of the following components:
 
Pension Plans
 
Year Ended December 31
(in thousands)
2016
 
2015
 
2014
Service cost
$
20,461

 
$
26,294

 
$
27,792

Interest cost
51,608

 
52,613

 
51,825

Expected return on assets
(121,470
)
 
(130,571
)
 
(120,472
)
Amortization of prior service cost
297

 
320

 
329

Recognized actuarial gain
—

 
(11,925
)
 
(28,880
)
Net Periodic Benefit for the Year
(49,104
)
 
(63,269
)
 
(69,406
)
Curtailment
—

 
(3,267
)
 
—

Settlement
(17,993
)
 
—

 
—

Early retirement programs and special separation benefit expense
—

 
4,606

 
8,374

Total Benefit for the Year
$
(67,097
)
 
$
(61,930
)
 
$
(61,032
)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
 
 
 
 
 
Current year actuarial loss
$
147,779

 
$
222,894

 
$
125,866

Amortization of prior service cost
(297
)
 
(320
)
 
(329
)
Recognized net actuarial gain
—

 
11,925

 
28,880

Curtailment and settlement
17,993

 
(51
)
 
(368
)
Total Recognized in Other Comprehensive Income (Before Tax Effects)
$
165,475

 
$
234,448

 
$
154,049

Total Recognized in Total Benefit and Other Comprehensive Income (Before Tax Effects)
$
98,378

 
$
172,518

 
$
93,017
Allocation of the Assets of the Company's Pension Plans
The assets of the Company’s pension plans were allocated as follows:
 
As of December 31
 
2016
 
2015
U.S. equities
53
%
 
62
%
U.S. stock index fund
30
%
 
—
%
U.S. fixed income
11
%
 
13
%
International equities
6
%
 
25
%
 
100
%
 
100
%
Fair Value, Assets Measured on Recurring Basis
The Company’s pension plan assets measured at fair value on a recurring basis were as follows:
 
As of December 31, 2016
(in thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Cash equivalents and other short-term investments
$
61,438

 
$
162,010

 
$
—

 
$
223,448

Equity securities
 
 
 
 
 
 
 
U.S. equities
1,074,528

 
—

 
—

 
1,074,528

International equities
120,735

 
—

 
—

 
120,735

U.S. stock index fund
—

 
—

 
622,865

 
622,865

Total Investments
$
1,256,701

 
$
162,010

 
$
622,865

 
$
2,041,576

Receivables
 
 
 
 
 
 
914

Total
 
 
 
 
 
 
$
2,042,490

 
As of December 31, 2015
(in thousands)
Level 1
 
Level 2
 
Total
Cash equivalents and other short-term investments
$
256,364

 
$
33,909

 
$
290,273

Equity securities
 
 
 
 
 
U.S. equities
1,378,158

 
—

 
1,378,158

International equities
564,263

 
—

 
564,263

Total Investments
$
2,198,785

 
$
33,909

 
$
2,232,694

Receivables
 
 
 
 
1,574

Total
 
 
 
 
$
2,234,268
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets
The following table provides a reconciliation of changes in pension assets measured at fair value on a recurring basis, using Level 3 inputs:
(in thousands)
U.S. stock index fund
Balance at December 31, 2015
$
—

Acquisitions
574,000

Actual return on plan assets:
 
Gains relating to assets still held at year-end
48,865

Balance at December 31, 2016
$
622,865
Supplemental Executive Retirement Plan (SERP) [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Obligation, Asset and Funding Information
 
SERP
 
As of December 31
(in thousands)
2016
 
2015
Change in Benefit Obligation
 
 
 
Benefit obligation at beginning of year
$
105,004

 
$
116,083

Service cost
985

 
1,946

Interest cost
4,384

 
4,550

Actuarial loss (gain)
1,120

 
(6,544
)
Benefits paid
(4,967
)
 
(6,083
)
Curtailment
—

 
(4,948
)
Benefit Obligation at End of Year
$
106,526

 
$
105,004

Change in Plan Assets
 
 
 
Fair value of assets at beginning of year
$
—

 
$
—

Employer contributions
4,967

 
6,083

Benefits paid
(4,967
)
 
(6,083
)
Fair Value of Assets at End of Year
$
—

 
$
—

Funded Status
$
(106,526
)
 
$
(105,004
)
Schedule of Net (Benefit) Costs
 
SERP
 
Year Ended December 31
(in thousands)
2016
 
2015
 
2014
Service cost
$
985

 
$
1,946

 
$
1,493

Interest cost
4,384

 
4,550

 
4,397

Amortization of prior service cost
457

 
457

 
47

Recognized actuarial loss
2,659

 
3,015

 
1,544

Net Periodic Cost for the Year
8,485

 
9,968

 
7,481

Special separation benefit expense
—

 
—

 
2,422

Total Cost for the Year
$
8,485

 
$
9,968

 
$
9,903

Other Changes in Benefit Obligations Recognized in Other Comprehensive Income
 
 
 
 
 
Current year actuarial loss (gain)
$
1,120

 
$
(6,544
)
 
$
19,168

Current year prior service cost
—

 
—

 
1,600

Amortization of prior service cost
(457
)
 
(457
)
 
(47
)
Recognized net actuarial loss
(2,659
)
 
(3,015
)
 
(1,544
)
Curtailment and settlement
—

 
(834
)
 
—

Total Recognized in Other Comprehensive Income (Before Tax Effects)
$
(1,996
)
 
$
(10,850
)
 
$
19,177

Total Recognized in Total Cost and Other Comprehensive Income (Before Tax Effects)
$
6,489

 
$
(882
)
 
$
29,080
Other Postretirement Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Obligation, Asset and Funding Information
The following table sets forth obligation, asset and funding information for the Company’s other postretirement plans:
 
Postretirement Plans
 
As of December 31
(in thousands)
2016
 
2015
Change in Benefit Obligation
 
 
 
Benefit obligation at beginning of year
$
37,391

 
$
41,957

Service cost
1,386

 
1,331

Interest cost
1,230

 
1,299

Actuarial gain
(14,984
)
 
(5,296
)
Benefits paid, net of Medicare subsidy
(852
)
 
(1,900
)
Benefit Obligation at End of Year
$
24,171

 
$
37,391

Change in Plan Assets
 
 
 
Fair value of assets at beginning of year
$
—

 
$
—

Employer contributions
852

 
1,900

Benefits paid, net of Medicare subsidy
(852
)
 
(1,900
)
Fair Value of Assets at End of Year
$
—

 
$
—

Funded Status
$
(24,171
)
 
$
(37,391
)
Schedule of Amounts Recognized in Balance Sheet
The amounts recognized in the Company’s Consolidated Balance Sheets for its other postretirement plans are as follows:
 
Postretirement Plans
 
As of December 31
(in thousands)
2016
 
2015
Current liability
$
(2,312
)
 
$
(3,444
)
Noncurrent liability
(21,859
)
 
(33,947
)
Recognized Liability
$
(24,171
)
 
$
(37,391
)
Schedule of Estimated Benefit Payments
At December 31, 2016, future estimated benefit payments are as follows:
(in thousands)
Postretirement
Plans
2017
$
2,312

2018
$
2,240

2019
$
2,199

2020
$
2,319

2021
$
2,277

2022–2026
$
10,725
Schedule of Net (Benefit) Costs
The total (benefit) cost arising from the Company’s other postretirement plans consists of the following components:
 
Postretirement Plans
 
Year Ended December 31
(in thousands)
2016
 
2015
 
2014
Service cost
$
1,386

 
$
1,331

 
$
1,500

Interest cost
1,230

 
1,299

 
1,448

Amortization of prior service credit
(335
)
 
(502
)
 
(783
)
Recognized actuarial gain
(1,502
)
 
(996
)
 
(2,076
)
Net Periodic Cost
779

 
1,132

 
89

Curtailment
—

 
—

 
(1,292
)
Total Cost (Benefit) for the Year
$
779

 
$
1,132

 
$
(1,203
)
Other Changes in Benefit Obligations Recognized in Other Comprehensive Income
 
 
 
 
 
Current year actuarial (gain) loss
$
(14,984
)
 
$
(5,296
)
 
$
4,448

Amortization of prior service credit
335

 
502

 
783

Recognized actuarial gain
1,502

 
996

 
2,076

Curtailment and settlement
—

 
—

 
360

Total Recognized in Other Comprehensive Income (Before Tax Effects)
$
(13,147
)
 
$
(3,798
)
 
$
7,667

Total Recognized in (Benefit) Cost and Other Comprehensive Income (Before Tax Effects)
$
(12,368
)
 
$
(2,666
)
 
$
6,464
Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
AOCI included the following components of unrecognized net periodic benefit for the postretirement plans:
 
As of December 31
(in thousands)
2016
 
2015
Unrecognized actuarial gain
$
(25,186
)
 
$
(11,704
)
Unrecognized prior service credit
(326
)
 
(661
)
Gross Amount
(25,512
)
 
(12,365
)
Deferred tax liability
10,205

 
4,946

Net Amount
$
(15,307
)
 
$
(7,419
)
Schedule of Expected Net Periodic Cost to be Recognized in Accumulated Other Comprehensive Income (Loss)
During 2017, the Company expects to recognize the following amortization components of net periodic cost for the other postretirement plans:
(in thousands)
2017
Actuarial gain recognition
$
(3,953
)
Prior service credit recognition
$
(291
)
Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
A change of one percentage point in the assumed health care cost trend rates would have the following effects:
 
1%
 
1%
(in thousands)
Increase
 
Decrease
Benefit obligation at end of year
$
1,330

 
$
(1,220
)
Service cost plus interest cost
$
165

 
$
(148
)