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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [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
 
2015
 
2014
 
2015
 
2014
Change in benefit obligation:
 

 
 

 
 

 
 

Benefit obligation at January 1
$
(150,199
)
 
$
(150,911
)
 
$
(9,031
)
 
$
(8,899
)
Service cost
(532
)
 
(523
)
 
(8
)
 
(9
)
Interest cost
(4,992
)
 
(6,196
)
 
(371
)
 
(430
)
Plan settlement
17,047

 
—

 
—

 
—

Special termination benefits
(3,831
)
 
—

 
—

 
—

Benefits paid
9,879

 
10,207

 
522

 
552

Expenses paid
490

 
322

 
—

 
—

Actuarial (gain) loss
(1,368
)
 
(3,098
)
 
454

 
(245
)
Benefit obligation at December 31
$
(133,506
)
 
$
(150,199
)
 
$
(8,434
)
 
$
(9,031
)
Change in plan assets:
 

 
 

 
 

 
 

Fair value of plan assets at January 1
$
134,017

 
$
137,036

 
$
—

 
$
—

Actual return on plan assets
(327
)
 
7,162

 
—

 
—

Plan settlement
(17,047
)
 
—

 
—

 
—

Expenses paid
(490
)
 
(322
)
 
—

 
—

Contributions
346

 
348

 
522

 
552

Benefits paid
(9,879
)
 
(10,207
)
 
(522
)
 
(552
)
Fair value of plan assets at December 31
$
106,620

 
$
134,017

 
$
—

 
$
—

Unfunded status at December 31
$
(26,886
)
 
$
(16,182
)
 
$
(8,434
)
 
$
(9,031
)
Amounts recognized in the consolidated balance sheets:
 

 
 

 
 

 
 

Prepaid pension costs
$
20,650

 
$
25,032

 
$
—

 
$
—

Other accrued liabilities
(320
)
 
(324
)
 
(595
)
 
(607
)
Non-current employee benefit liabilities
(47,216
)
 
(40,890
)
 
(7,839
)
 
(8,424
)
Net amounts recognized
$
(26,886
)
 
$
(16,182
)
 
$
(8,434
)
 
$
(9,031
)
Schedule of Net Benefit Costs
 
Pension Benefits
 
Other Postretirement
Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Service cost — benefits earned during the period
$
532

 
$
523

 
$
1,170

 
$
8

 
$
9

 
$
16

Interest cost on projected benefit obligation
4,992

 
6,196

 
5,518

 
371

 
430

 
418

Expected return on assets
(7,378
)
 
(8,518
)
 
(7,915
)
 
—

 
—

 
—

Settlement loss
3,214

 
—

 
244

 
—

 
—

 
—

Special termination benefit recognized
3,831

 
—

 
—

 
—

 
—

 
—

Amortization of net loss (gain)
1,083

 
1,075

 
1,918

 
(97
)
 
(60
)
 
(64
)
Net expense (income)
$
6,274

 
$
(724
)
 
$
935

 
$
282

 
$
379

 
$
370
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 2016.

 
Defined
Benefit
Pension Plans
 
Post-
Retirement
Plans
 
Total
Actuarial loss (gain)
$
1,855

 
$
(75
)
 
$
1,780
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
As of December 31, 2015, accumulated other comprehensive (loss) income, before income taxes, consists of the following:
 
Defined
Benefit
Pension Plans
 
Post-
Retirement
Plans
 
Total
Accumulated other comprehensive (loss) income as of January 1, 2015
$
(30,481
)
 
$
582

 
$
(29,899
)
Amortization of gain (loss)
4,297

 
(97
)
 
4,200

Net (loss) gain arising during the year
(9,074
)
 
454

 
(8,620
)
Accumulated other comprehensive (loss) income as of December 31, 2015
$
(35,258
)
 
$
939

 
$
(34,319
)
As of December 31, 2014, 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, 2014
$
(27,102
)
 
$
886

 
$
(26,216
)
Amortization of gain (loss)
1,075

 
(60
)
 
1,015

Net loss arising during the year
(4,454
)
 
(244
)
 
(4,698
)
Accumulated other comprehensive (loss) income as of December 31, 2014
$
(30,481
)
 
$
582

 
$
(29,899
)
Schedule of Assumptions Used
 
Pension Benefits
 
Other Postretirement Benefits
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Weighted average assumptions:
 
 
 
 
 
 
 
 
 
 
 
Discount rates — benefit obligation
3.75% - 4.50%
 
2.75% - 4.00%
 
3.00% - 4.75%
 
4.75%
 
4.25%
 
5.00%
Discount rates — service cost
2.75% - 4.25%
 
3.00% - 4.75%
 
2.25% - 4.00%
 
4.25%
 
5.00%
 
4.25%
Assumed rates of return on invested assets
6.00%
 
6.50%
 
6.50%
 
—%
 
—%
 
—%
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 at December 31, 2015 and 2014, by asset category, were as follows:

 
Plan Assets at
December 31,
 
2015
 
2014
Asset category:
 

 
 

Equity securities
51
%
 
50
%
Investment grade fixed income securities
30
%
 
29
%
High yield fixed income securities
11
%
 
10
%
Alternative investments
3
%
 
5
%
Short-term investments
5
%
 
6
%
Total
100
%
 
100
%

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

 
 
Fair Value Measurements as of December 31, 2015
 
 
 
 
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
 
$
1,760

 
$
—

 
$
1,760

 
$
—

Amounts in individually managed investment accounts:
 
 

 
 
 
 
 


Cash
 
5,429

 
5,429

 
—

 
—

U.S. equity securities
 
28,434

 
28,434

 
—

 
—

Common collective trusts
 
56,327

 
—

 
56,327

 
—

Investment partnership
 
14,670

 
—

 
11,256

 
3,414

Total
 
$
106,620

 
$
33,863

 
$
69,343

 
$
3,414


 
 
Fair Value Measurements as of December 31, 2014
 
 
 
 
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
 
$
1,762

 
$
—

 
$
1,762

 
$
—

Amounts in individually managed investment accounts:
 
 

 
 

 
 

 
 

Cash, mutual funds and common stock
 
8,319

 
8,319

 
—

 
—

U.S. equity securities
 
42,046

 
42,046

 
—

 
—

Common collective trusts
 
61,877

 
—

 
61,877

 
—

Investment partnership
 
20,013

 
—

 
13,189

 
6,824

Total
 
$
134,017

 
$
50,365

 
$
76,828

 
$
6,824
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, 2015 and 2014 were as follows:

 
2015
 
2014
Balance as of January 1
$
6,824

 
$
9,031

Transfers
—

 
(641
)
Distributions
(2,904
)
 
(1,018
)
Unrealized (loss) gain on long-term investments
(470
)
 
3,403

Realized loss on long-term investments
(36
)
 
(3,951
)
Balance as of December 31
$
3,414

 
$
6,824
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
$
4

 
$
(4
)
Effect on benefit obligation
79

 
(74
)
Schedule of Expected Benefit Payments
Estimated future pension and postretirement medical benefits payments are as follows:

 
Pension
 
Postretirement
Medical
2016
$
9,548

 
$
595

2017
9,053

 
618

2018
8,618

 
607

2019
8,139

 
609

2020
14,786

 
606

2021 - 2025
79,462

 
2,953