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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following table provides a reconciliation of benefit obligations, plan assets and the funded status of the pension plans and other postretirement benefits:
 
Pension Benefits
 
Other
Postretirement Benefits
 
2019
 
2018
 
2019
 
2018
Change in benefit obligation:
 

 
 

 
 

 
 

Benefit obligation at January 1
$
(123,165
)
 
$
(132,722
)
 
$
(8,296
)
 
$
(8,967
)
Service cost
(533
)
 
(587
)
 
(3
)
 
(4
)
Interest cost
(4,860
)
 
(4,495
)
 
(347
)
 
(330
)
Plan amendment
—

 
—

 
—

 
(39
)
Benefits paid
7,696

 
8,524

 
594

 
553

Expenses paid
391

 
260

 
—

 
—

Actuarial gain
(8,526
)
 
5,855

 
(934
)
 
491

Benefit obligation at December 31
$
(128,997
)
 
$
(123,165
)
 
$
(8,986
)
 
$
(8,296
)
Change in plan assets:
 

 
 

 
 

 
 

Fair value of plan assets at January 1
$
93,167

 
$
106,192

 
$
—

 
$
—

Actual return on plan assets
15,788

 
(4,497
)
 
—

 
—

Expenses paid
(391
)
 
(260
)
 
—

 
—

Contributions
183

 
256

 
594

 
553

Benefits paid
(7,696
)
 
(8,524
)
 
(594
)
 
(553
)
Fair value of plan assets at December 31
$
101,051

 
$
93,167

 
$
—

 
$
—

Unfunded status at December 31
$
(27,946
)
 
$
(29,998
)
 
$
(8,986
)
 
$
(8,296
)
Amounts recognized in the consolidated balance sheets:
 

 
 

 
 

 
 

Prepaid pension costs
$
31,686

 
$
23,869

 
$
—

 
$
—

Other accrued liabilities
(111
)
 
(228
)
 
(654
)
 
(647
)
Non-current employee benefit liabilities
(59,521
)
 
(53,639
)
 
(8,332
)
 
(7,649
)
Net amounts recognized
$
(27,946
)
 
$
(29,998
)
 
$
(8,986
)
 
$
(8,296
)
Schedule of Net Benefit Costs
 
Pension Benefits
 
Other Postretirement
Benefits
 
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Service cost — benefits earned during the period
$
533

 
$
587

 
$
564

 
$
3

 
$
4

 
$
5

Interest cost on projected benefit obligation
4,860

 
4,495

 
5,059

 
347

 
330

 
368

Expected return on assets
(4,874
)
 
(5,572
)
 
(5,424
)
 
—

 
—

 
—

Prior service cost
—

 
—

 
—

 
4

 
4

 
—

Amortization of net loss (gain)
2,001

 
1,804

 
2,009

 
(40
)
 
(41
)
 
(54
)
Net expense
$
2,520

 
$
1,314

 
$
2,208

 
$
314

 
$
297

 
$
319
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year

The following table summarizes amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost for the year ending 2020.

 
Defined
Benefit
Pension Plans
 
Post-
Retirement
Plans
 
Total
Prior service cost
$
—

 
$
4

 
$
4

Actuarial loss
$
1,836

 
$
11

 
$
1,847
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
As of December 31, 2019, accumulated other comprehensive (loss) income, before income taxes, consisted of the following:
 
Defined
Benefit
Pension Plans
 
Post-
Retirement
Plans
 
Total
Accumulated other comprehensive (loss) income as of January 1, 2019
$
(34,053
)
 
$
213

 
$
(33,840
)
Amortization of prior service costs
—

 
4

 
4

Prior service costs
—

 
(37
)
 
(37
)
Amortization of loss (gain)
2,001

 
(40
)
 
1,961

Net gain (loss) arising during the year
2,388

 
(934
)
 
1,454

Accumulated other comprehensive loss as of December 31, 2019
$
(29,664
)
 
$
(794
)
 
$
(30,458
)


As of December 31, 2018, accumulated other comprehensive (loss) income, before income taxes, consisted of the following:
 
Defined
Benefit
Pension Plans
 
Post-
Retirement
Plans
 
Total
Accumulated other comprehensive loss as of January 1, 2018
$
(31,643
)
 
$
(237
)
 
$
(31,880
)
Amortization of loss (gain)
1,804

 
(41
)
 
1,763

Net (loss) gain arising during the year
(4,214
)
 
491

 
(3,723
)
Accumulated other comprehensive loss (income) as of December 31, 2018
$
(34,053
)
 
$
213

 
$
(33,840
)
Schedule of Assumptions Used
 
Pension Benefits
 
Other Postretirement Benefits
 
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Weighted average assumptions:
 
 
 
 
 
 
 
 
 
 
 
Discount rates — benefit obligation
2.55% - 3.1%
 
3.9% - 4.25%
 
3.25% - 3.7%
 
3.30%
 
4.35%
 
3.80%
Discount rates — service cost
3.9% - 4.25%
 
3.25% - 3.7%
 
3.6% - 4.2%
 
4.35%
 
3.80%
 
4.40%
Assumed rates of return on invested assets
5.50%
 
5.50%
 
5.50%
 
N/A
 
N/A
 
N/A
Salary increase assumptions
N/A
 
N/A
 
N/A
 
3.00%
 
3.00%
 
3.00%
Schedule of Allocation of Plan Assets
Vector’s defined benefit retirement plan allocations by asset category, were as follows:

 
Plan Assets at
December 31,
 
2019
 
2018
Asset category:
 

 
 

Equity securities
38
%
 
52
%
Investment grade fixed income securities
53
%
 
39
%
High yield fixed income securities
9
%
 
9
%
Total
100
%
 
100
%

The defined benefit plans’ recurring financial assets subject to fair value measurements and the necessary disclosures were as follows:

 
 
Fair Value Measurements as of December 31, 2019
 
 
 
 
Quoted Prices in
Active Markets for
Identical Assets
 
Significant Other
Observable Inputs
 
Significant
Unobservable Inputs
Description
 
Total
 
(Level 1)
 
(Level 2)
 
(Level 3)
Assets:
 
 

 
 

 
 

 
 

Insurance contracts
 
$
2,398

 
$
—

 
$
2,398

 
$
—

Amounts in individually managed investment accounts:
 
 

 
 
 
 
 


Cash, mutual funds and common stock
 
76

 
76

 
—

 
—

Common collective trusts
 
38,537

 
—

 
38,537

 
—

Common collective trusts at NAV (1)
 
51,068

 
—

 
—

 
—

Mutual Funds
 
8,972

 
—

 
8,972

 
—

Total
 
$
101,051

 
$
76

 
$
49,907

 
$
—

(1) In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.

 
 
Fair Value Measurements as of December 31, 2018
 
 
 
 
Quoted Prices in
Active Markets for
Identical Assets
 
Significant Other
Observable Inputs
 
Significant
Unobservable Inputs
Description
 
Total
 
(Level 1)
 
(Level 2)
 
(Level 3)
Assets:
 
 

 
 

 
 

 
 

Insurance contracts
 
$
2,161

 
$
—

 
$
2,161

 
$
—

Amounts in individually managed investment accounts:
 
 

 
 

 
 

 
 

Cash, mutual funds and common stock
 
175

 
175

 
—

 
—

Common collective trusts
 
48,126

 
—

 
48,126

 
—

Common collective trusts at NAV(1)
 
33,731

 
—

 
—

 
—

Investment Partnership
 
8,974

 
—

 
8,974

 
—

Total
 
$
93,167

 
$
175

 
$
59,261

 
$
—

(1) In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets
The changes in the fair value of the Level 3 investments as of December 31, 2019 and 2018 were as follows:

 
2019
 
2018
Balance as of January 1
$
—

 
$
127

Distributions
—

 
(127
)
Balance as of December 31
$
—

 
$
—
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates A 1% change in assumed health care cost trend rates would have the following effects:

 
1% Increase
 
1% Decrease
Effect on total of service and interest cost components
$
2

 
$
(2
)
Effect on benefit obligation
47

 
(44
)
Schedule of Expected Benefit Payments
Estimated future pension and postretirement medical benefits payments were as follows:
 
Pension
 
Postretirement
Medical
2020
$
7,548

 
$
655

2021
14,708

 
651

2022
6,614

 
650

2023
6,200

 
644

2024
56,959

 
640

2025 - 2029
23,303

 
2,897