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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [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
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
1,333

 
$
1,335

 
$
357

 
$
293

 
$
(4
)
 
$
73

 
$
1,686

 
$
1,701

Interest cost
6,121

 
6,282

 
188

 
175

 
405

 
444

 
6,714

 
6,901

Expected return on plan assets
(5,118
)
 
(6,278
)
 
—

 
—

 
—

 
—

 
(5,118
)
 
(6,278
)
Amortization of unrecognized prior service costs (benefits)
—

 
—

 
(52
)
 
(276
)
 
125

 
125

 
73

 
(151
)
Amortization of losses (gains) from earlier periods
2,199

 
2,485

 
(113
)
 
(85
)
 
(13
)
 
(15
)
 
2,073

 
2,385

Net periodic cost (benefit)
$
4,535

 
$
3,824

 
$
380

 
$
107

 
$
513

 
$
627

 
$
5,428

 
$
4,558

 
Six Months Ended June 30,
 
Defined Benefit 
Pension Plan
 
Post-Retirement 
Medical Plan
 
Supplemental Executive
Retirement Plan
 
Total
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
(734
)
 
$
2,670

 
$
714

 
$
586

 
$
(8
)
 
$
146

 
$
(28
)
 
$
3,402

Interest cost
12,242

 
12,564

 
376

 
350

 
810

 
888

 
13,428

 
13,802

Expected return on plan assets
(10,236
)
 
(12,556
)
 
—

 
—

 
—

 
—

 
(10,236
)
 
(12,556
)
Amortization of unrecognized prior service costs (benefits)
—

 
—

 
(104
)
 
(552
)
 
250

 
250

 
146

 
(302
)
Amortization of losses (gains) from earlier periods
4,398

 
4,970

 
(226
)
 
(170
)
 
(26
)
 
(30
)
 
4,146

 
4,770

Net periodic cost (benefit)
$
5,670

 
$
7,648

 
$
760

 
$
214

 
$
1,026

 
$
1,254

 
$
7,456

 
$
9,116



The Company expects to make payments of approximately $753 with respect to its Post-Retirement Medical Plan and $3,336 with respect to its Supplemental Executive Retirement Plan during the year ended December 31, 2017.  The Company expects to make contributions of zero to its Defined Benefit Pension Plan during the year ended December 31, 2017.  A December 31 measurement date is used for the employee benefit plans.
 
The following table summarizes payments made to the Post-Retirement Medical Plan and the Supplemental Executive Retirement Plan:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2017
 
2016
 
2017
 
2016
Payments to the Post-Retirement Medical Plan
 
207

 
187

 
376

 
391

Payments to the Supplemental Executive Retirement Plan
 
834

 
834

 
1,668

 
1,668