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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
 
Net periodic cost (benefit) of the Defined Benefit Pension, Post-Retirement Medical, and Supplemental Executive Retirement plans included in general insurance expenses in the accompanying condensed consolidated statements of income includes the following components:
 
 
Three Months Ended June 30,
 
Defined Benefit 
Pension Plan
 
Post-Retirement 
Medical Plan
 
Supplemental Executive
Retirement Plan
 
Total
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
1,509

 
$
1,175

 
$
264

 
$
206

 
$
70

 
$
205

 
$
1,843

 
$
1,586

Interest cost
5,997

 
5,739

 
126

 
130

 
531

 
696

 
6,654

 
6,565

Expected return on plan assets
(7,087
)
 
(7,319
)
 
—

 
—

 
—

 
—

 
(7,087
)
 
(7,319
)
Amortization of unrecognized prior service costs (benefits)
3

 
13

 
(417
)
 
(427
)
 
233

 
233

 
(181
)
 
(181
)
Amortization of losses (gains) from earlier periods
3,106

 
644

 
(157
)
 
(130
)
 
166

 
93

 
3,115

 
607

Net periodic cost (benefit)
$
3,528

 
$
252

 
$
(184
)
 
$
(221
)
 
$
1,000

 
$
1,227

 
$
4,344

 
$
1,258


 
Six Months Ended June 30,
 
Defined Benefit 
Pension Plan
 
Post-Retirement 
Medical Plan
 
Supplemental Executive
Retirement Plan
 
Total
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
3,017

 
$
2,349

 
$
528

 
$
412

 
$
141

 
$
410

 
$
3,686

 
$
3,171

Interest cost
11,994

 
11,477

 
253

 
260

 
1,061

 
1,393

 
13,308

 
13,130

Expected return on plan assets
(14,174
)
 
(14,638
)
 
—

 
—

 
—

 
—

 
(14,174
)
 
(14,638
)
Amortization of unrecognized prior service costs (benefits)
7

 
26

 
(835
)
 
(853
)
 
466

 
466

 
(362
)
 
(361
)
Amortization of losses (gains) from earlier periods
6,212

 
1,289

 
(315
)
 
(260
)
 
332

 
185

 
6,229

 
1,214

Net periodic cost (benefit)
$
7,056

 
$
503

 
$
(369
)
 
$
(441
)
 
$
2,000

 
$
2,454

 
$
8,687

 
$
2,516



The Company expects to make payments of approximately $1,048 with respect to its Post-Retirement Medical Plan and $4,825 with respect to its Supplemental Executive Retirement Plan during the year ended December 31, 2015.  The Company expects to make contributions of zero to its Defined Benefit Pension Plan during the year ended December 31, 2015.  A December 31 measurement date is used for the employee benefit plans.
 
The following table summarizes contributions to the Defined Benefit Pension Plan and payments made to the Post-Retirement Medical Plan and the Supplemental Executive Retirement Plan:
 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Contributions to the Defined Benefit Pension Plan
 
$
—

 
$
2,690

 
$
—

 
$
4,714

Payments to the Post-Retirement Medical Plan
 
391

 
84

 
524

 
215

Payments to the Supplemental Executive Retirement Plan
 
830

 
882

 
3,165

 
1,789