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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic cost (benefit)
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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of contributions to the Defined Benefit Pension Plan and payments made to the Post-Retirement Medical Plan and the Supplemental Executive Retirement Plan
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