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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
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
$
—

 
$
1,333

 
$
376

 
$
357

 
$
—

 
$
(4
)
 
$
376

 
$
1,686

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)
—

 
—

 
(5
)
 
(52
)
 
81

 
125

 
76

 
73

Amortization of losses (gains) from earlier periods
584

 
2,199

 
(70
)
 
(113
)
 
(11
)
 
(13
)
 
503

 
2,073

Net periodic cost (benefit)
$
962

 
$
4,535


$
473


$
380


$
409


$
513


$
1,844


$
5,428

 
Six Months Ended June 30,
 
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
$
—

 
$
(734
)
 
$
752

 
$
714

 
$
—

 
$
(8
)
 
$
752

 
$
(28
)
Interest cost
11,419

 
12,242

 
344

 
376

 
678

 
810

 
12,441

 
13,428

Expected return on plan assets
(10,661
)
 
(10,236
)
 
—

 
—

 
—

 
—

 
(10,661
)
 
(10,236
)
Amortization of unrecognized prior service costs (benefits)
—

 
—

 
(10
)
 
(104
)
 
162

 
250

 
152

 
146

Amortization of losses (gains) from earlier periods
1,168

 
4,398

 
(138
)
 
(226
)
 
(23
)
 
(26
)
 
1,007

 
4,146

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net periodic cost (benefit)
$
1,926

 
$
5,670


$
948


$
760


$
817


$
1,026


$
3,691


$
7,456
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 June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Payments to the Post-Retirement Medical Plan
 
$
34

 
$
207

 
$
117

 
$
376

Payments to the Supplemental Executive Retirement Plan
 
599

 
834

 
1,199

 
1,668