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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [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
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
—

 
$
(2,067
)
 
$
376

 
$
357

 
$
—

 
$
(4
)
 
$
376

 
$
(1,714
)
Interest cost
5,709

 
6,121

 
172

 
188

 
339

 
405

 
6,220

 
6,714

Expected return on plan assets
(5,331
)
 
(5,118
)
 
—

 
—

 
—

 
—

 
(5,331
)
 
(5,118
)
Amortization of unrecognized prior service costs (benefits)
—

 
—

 
(69
)
 
(52
)
 
81

 
125

 
12

 
73

Amortization of losses (gains) from earlier periods
584

 
2,199

 
(5
)
 
(113
)
 
(11
)
 
(13
)
 
568

 
2,073

Net periodic cost (benefit)
$
962

 
$
1,135

 
$
474

 
$
380

 
$
409

 
$
513

 
$
1,845

 
$
2,028

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 payments made to the Post-Retirement Medical Plan and the Supplemental Executive Retirement Plan:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
Payments to the Post-Retirement Medical Plan
 
$
82

 
$
169

Payments to the Supplemental Executive Retirement Plan
 
599

 
834