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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2017
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 March 31,
 
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
$
(2,067
)
 
$
1,335

 
$
357

 
$
293

 
$
(4
)
 
$
73

 
$
(1,714
)
 
$
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)
$
1,135

 
$
3,824

 
$
380

 
$
107

 
$
513

 
$
627

 
$
2,028

 
$
4,558

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

The Company expects to make payments of approximately $678 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 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 March 31,
 
 
2017
 
2016
Payments to the Post-Retirement Medical Plan
 
169

 
204

Payments to the Supplemental Executive Retirement Plan
 
834

 
834