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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
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 cost were as follows:
 
2015
 
2014
 
2013
Service cost
$
549

 
$
453

 
$
699

Interest cost
6,938

 
6,885

 
6,327

Expected return on assets
(9,395
)
 
(8,381
)
 
(9,278
)
Amortization of prior service cost
244

 
282

 
322

Amortization of actuarial loss
4,018

 
1,717

 
1,942

Settlement charge
3,915

 
—

 
—

Curtailment charge
2,923

 
—

 
—

Net periodic pension plans cost
$
9,192

 
$
956

 
$
12
Schedule of Changes in Projected Benefit Obligations
The status of the pension plans at December 31, 2015 and 2014 were as follows:
 
2015
 
2014
Change in projected benefit obligation:
 
 
 
Projected benefit obligation at beginning of year
$
193,322

 
$
156,989

Service cost
549

 
453

Interest cost
6,938

 
6,885

Settlement gain
(2,162
)
 
—

Curtailment loss
2,154

 
—

Plan change
—

 
719

Benefit payments
(25,383
)
 
(7,587
)
Actuarial (gain) loss
(12,477
)
 
35,863

Projected benefit obligation at end of year
$
162,941

 
$
193,322

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
$
183,671

 
$
168,408

Actual (loss) return on assets
(4,140
)
 
22,521

Employer contributions
358

 
329

Benefit payments
(25,383
)
 
(7,587
)
Fair value of plan assets at end of year
$
154,506

 
$
183,671

Funded status – net liability
$
(8,435
)
 
$
(9,651
)
Amounts recognized in the consolidated balance sheets consist of:
 
 
 
Prepaid pension cost
$
8,422

 
$
7,092

Accrued liabilities
(362
)
 
(322
)
Pension benefit obligations
(16,495
)
 
(16,421
)
Net amount recognized
$
(8,435
)
 
$
(9,651
)
Pre-tax components of accumulated other comprehensive loss:
 
 
 
Unrecognized actuarial loss
$
(35,972
)
 
$
(45,009
)
Unrecognized prior service cost
(717
)
 
(1,731
)
Total
$
(36,689
)
 
$
(46,740
)
Accumulated benefit obligation
$
162,290

 
$
192,638
Schedule of Assumptions Used
The assumptions used to measure the projected benefit obligations for the Company’s defined benefit pension plans were as follows:
 
2015
 
2014
Discount rate
4.00%
 
3.75%
Projected annual salary increases
0 - 3.00%
 
0 - 3.00%
The assumptions used to determine net periodic pension cost were as follows: 
 
2015
 
2014
 
2013
Discount rate
3.50 - 3.75%
 
4.50%
 
3.50 - 3.75%
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, 2015:
 
Level 1
 
Level 2
 
Level 3
 
Total
Fixed income securities (a)
$
16,028

 
$
137,943

 
$
—

 
$
153,971

Accounts receivable – pending trades
 
 
 
 
 
 
535

Total
 
 
 
 
 
 
$
154,506

(a) Fixed income securities are comprised of corporate bonds (96%), government agencies securities (2%) and other fixed income securities (2%).
The fair values of the Company’s pension plan assets fall within the following levels of the fair value hierarchy as of December 31, 2014:
 
Level 1
 
Level 2
 
Level 3
 
Total
Fixed income securities (b)
$
15,839

 
$
167,882

 
$
—

 
$
183,721

Accounts payable – pending trades
 
 
 
 
 
 
(50
)
Total
 
 
 
 
 
 
$
183,671


(b) Fixed income securities are comprised of corporate bonds (75%), government bonds (17%), government agencies securities (4%) and other fixed income securities (4%).
Schedule of Expected Benefit Payments
The estimated future pension benefit payments are:
2016
$
8,193

2017
8,554

2018
8,786

2019
8,974

2020
9,181

2021 — 2025
48,380
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) cost for 2015, 2014 and 2013 were as follows:
 
2015
 
2014
 
2013
Service cost
$
83

 
$
56

 
$
153

Interest cost
79

 
76

 
148

Amortization of actuarial gain
(197
)
 
(336
)
 
(23
)
Net periodic postretirement plan (benefit) cost
$
(35
)
 
$
(204
)
 
$
278
Schedule of Changes in Projected Benefit Obligations
The status of the postretirement plan at December 31, 2015 and 2014 was as follows:
 
2015
 
2014
Change in accumulated postretirement benefit obligations:
 
 
 
Accumulated postretirement benefit obligation at beginning of year
$
2,552

 
$
1,977

Service cost
83

 
56

Interest cost
79

 
76

Benefit payments
(202
)
 
(224
)
Actuarial loss (gain)
(85
)
 
667

Accumulated postretirement benefit obligation at end of year
$
2,427

 
$
2,552

Funded status – net liability
$
(2,427
)
 
$
(2,552
)
Amounts recognized in the consolidated balance sheets consist of:
 
 
 
Accrued liabilities
$
(246
)
 
$
(226
)
Postretirement benefit obligations
(2,181
)
 
(2,326
)
Net amount recognized
$
(2,427
)
 
$
(2,552
)
Pre-tax components of accumulated other comprehensive loss:
 
 
 
Unrecognized actuarial gain
$
2,024

 
$
2,137

Total
$
2,024

 
$
2,137
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:
 
2015
 
2014
 
2013
Net periodic postretirement benefit costs
3.25%
 
4.00%
 
3.50%
Accumulated postretirement benefit obligations
3.50%
 
3.25%
 
4.00%
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:
 
2015
 
2014
 
2013
Medical cost trend rate
6.50%
 
7.00%
 
7.50%
Ultimate medical cost trend rate
5.00%
 
5.00%
 
5.00%
Year ultimate medical cost trend rate will be reached
2019
 
2019
 
2019