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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Pension Plans, Defined Benefit  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of the net periodic pension and postretirement benefit cost
Components of net periodic pension plans (benefit) cost were as follows:
 
2016
 
2015
 
2014
Service cost
$
377

 
$
549

 
$
453

Interest cost
5,182

 
6,938

 
6,885

Expected return on assets
(8,139
)
 
(9,395
)
 
(8,381
)
Amortization of prior service cost
200

 
244

 
282

Amortization of actuarial loss
1,832

 
4,018

 
1,717

Settlement charge
—

 
3,915

 
—

Curtailment charge
—

 
2,923

 
—

Net periodic pension plans (benefit) cost
$
(548
)
 
$
9,192

 
$
956
Schedule of Changes in Projected Benefit Obligations
The status of the pension plans at December 31, 2016 and 2015 were as follows:
 
2016
 
2015
Change in projected benefit obligation:
 
 
 
Projected benefit obligation at beginning of year
$
162,941

 
$
193,322

Service cost
377

 
549

Interest cost
5,182

 
6,938

Settlement gain
—

 
(2,162
)
Curtailment loss
—

 
2,154

Benefit payments
(9,459
)
 
(25,383
)
Actuarial gain
(4,361
)
 
(12,477
)
Projected benefit obligation at end of year
$
154,680

 
$
162,941

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
$
154,506

 
$
183,671

Actual return (loss) on assets
12,253

 
(4,140
)
Employer contributions
414

 
358

Benefit payments
(9,459
)
 
(25,383
)
Fair value of plan assets at end of year
$
157,714

 
$
154,506

Funded status – net asset (liability)
$
3,034

 
$
(8,435
)
Amounts recognized in the consolidated balance sheets consist of:
 
 
 
Prepaid pension cost
$
8,501

 
$
8,422

Accrued liabilities
(367
)
 
(362
)
Pension benefit obligations
(5,100
)
 
(16,495
)
Net amount recognized
$
3,034

 
$
(8,435
)
Pre-tax components of accumulated other comprehensive loss:
 
 
 
Unrecognized actuarial loss
$
(25,665
)
 
$
(35,972
)
Unrecognized prior service cost
(517
)
 
(717
)
Total
$
(26,182
)
 
$
(36,689
)
Accumulated benefit obligation
$
154,044

 
$
162,290
Schedule of Assumptions Used
The assumptions used to measure the projected benefit obligations for the Company’s defined benefit pension plans were as follows:
 
2016
 
2015
Discount rate
3.70 - 3.83%
 
4.00%
Projected annual salary increases
0 - 3.00%
 
0 - 3.00%
The assumptions used to determine net periodic pension cost were as follows: 
 
2016
 
2015
 
2014
Discount rate
4.00%
 
3.50 - 3.75%
 
4.50%
Expected long-term rate of return on plan assets
5.25%
 
5.25%
 
5.25%
Projected annual salary increases
0 - 3.00%
 
0 - 3.00%
 
0 - 3.00%
Schedule of Fair Value of Plan Assets
The fair values of the Company’s pension plan assets fall within the following levels of the fair value hierarchy as of December 31, 2016:
 
Level 1
 
Level 2
 
Level 3
 
Total
Fixed income securities (a)
$
16,427

 
$
142,486

 
$
—

 
$
158,913

Investments measured at net asset value (a)
 
 
 
 
 
 
5,455

Accounts payable – pending trades
 
 
 
 
 
 
(6,654
)
Total
 
 
 
 
 
 
$
157,714

(a) Fixed income securities are comprised of corporate bonds (87%), government bonds (4%), government agency securities (2%) and other fixed income securities (7%).
The fair values of the Company’s pension plan assets fall within the following levels of the fair value hierarchy as of December 31, 2015:
 
Level 1
 
Level 2
 
Level 3
 
Total
Fixed income securities (b)
$
16,028

 
$
134,514

 
$
—

 
$
150,542

Investments measured at net asset value (b)
 
 
 
 
 
 
3,429

Accounts receivable – pending trades
 
 
 
 
 
 
535

Total
 
 
 
 
 
 
$
154,506


(b) Fixed income securities are comprised of corporate bonds (96%), government agency securities (2%) and other fixed income securities (2%).
Schedule of Expected Benefit Payments
The estimated future pension benefit payments are:
2017
$
9,078

2018
9,183

2019
9,235

2020
9,324

2021
9,522

2022 — 2026
47,219
Other Postretirement Benefit Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of the net periodic pension and postretirement benefit cost
Components of net periodic postretirement plan benefit for 2016, 2015 and 2014 were as follows:
 
2016
 
2015
 
2014
Service cost
$
71

 
$
83

 
$
56

Interest cost
65

 
79

 
76

Amortization of actuarial gain
(209
)
 
(197
)
 
(336
)
Net periodic postretirement plan benefit
$
(73
)
 
$
(35
)
 
$
(204
)
Schedule of Changes in Projected Benefit Obligations
The status of the postretirement plan at December 31, 2016 and 2015 was as follows:
 
2016
 
2015
Change in accumulated postretirement benefit obligations:
 
 
 
Accumulated postretirement benefit obligation at beginning of year
$
2,427

 
$
2,552

Service cost
71

 
83

Interest cost
65

 
79

Benefit payments
(240
)
 
(202
)
Actuarial gain
(759
)
 
(85
)
Accumulated postretirement benefit obligation at end of year
$
1,564

 
$
2,427

Funded status – net liability
$
(1,564
)
 
$
(2,427
)
Amounts recognized in the consolidated balance sheets consist of:
 
 
 
Accrued liabilities
$
(234
)
 
$
(246
)
Postretirement benefit obligations
(1,330
)
 
(2,181
)
Net amount recognized
$
(1,564
)
 
$
(2,427
)
Pre-tax components of accumulated other comprehensive loss:
 
 
 
Unrecognized actuarial gain
$
2,574

 
$
2,024

Total
$
2,574

 
$
2,024
Schedule of Assumptions Used
The weighted average discount rate used to determine the net periodic postretirement benefit costs and the accumulated postretirement benefit obligations were as follows:
 
2016
 
2015
 
2014
Net periodic postretirement benefit costs
3.50%
 
3.25%
 
4.00%
Accumulated postretirement benefit obligations
3.61%
 
3.50%
 
3.25%
Schedule of Assumed Health Care Cost and Trend Rates for Medical Plans
The assumed health care cost trend rates for medical plans at December 31 were as follows:
 
2016
 
2015
 
2014
Medical cost trend rate
6.00%
 
6.50%
 
7.00%
Ultimate medical cost trend rate
5.00%
 
5.00%
 
5.00%
Year ultimate medical cost trend rate will be reached
2019
 
2019
 
2019