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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
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 September 30,
 
Defined Benefit 
Pension Plan
 
Post-Retirement 
Medical Plan
 
Supplemental Executive
Retirement Plan
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
3,417

 
$
1,521

 
$
349

 
$
254

 
$
73

 
$
70

 
$
3,839

 
$
1,845

Interest cost
6,384

 
5,996

 
184

 
167

 
444

 
531

 
7,012

 
6,694

Expected return on plan assets
(6,237
)
 
(7,084
)
 
—

 
—

 
—

 
—

 
(6,237
)
 
(7,084
)
Amortization of unrecognized prior service costs (benefits)
—

 
3

 
(275
)
 
(395
)
 
125

 
233

 
(150
)
 
(159
)
Amortization of losses (gains) from earlier periods
2,726

 
3,086

 
(67
)
 
16

 
(15
)
 
166

 
2,644

 
3,268

Net periodic cost (benefit)
$
6,290

 
$
3,522

 
$
191

 
$
42

 
$
627

 
$
1,000

 
$
7,108

 
$
4,564

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
Defined Benefit 
Pension Plan
 
Post-Retirement 
Medical Plan
 
Supplemental Executive
Retirement Plan
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
6,087

 
$
4,538

 
$
935

 
$
781

 
$
219

 
$
211

 
$
7,241

 
$
5,530

Interest cost
18,948

 
17,990

 
534

 
420

 
1,332

 
1,592

 
20,814

 
20,002

Expected return on plan assets
(18,793
)
 
(21,258
)
 
—

 
—

 
—

 
—

 
(18,793
)
 
(21,258
)
Amortization of unrecognized prior service costs (benefits)
—

 
10

 
(827
)
 
(1,230
)
 
375

 
700

 
(452
)
 
(520
)
Amortization of losses (gains) from earlier periods
7,695

 
9,298

 
(237
)
 
(298
)
 
(44
)
 
497

 
7,414

 
9,497

Net periodic cost (benefit)
$
13,937

 
$
10,578

 
$
405

 
$
(327
)
 
$
1,882

 
$
3,000

 
$
16,224

 
$
13,251
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 September 30,
 
Nine Months Ended September 30,
 
 
2016
 
2015
 
2016
 
2015
Payments to the Post-Retirement Medical Plan
 
212

 
576

 
603

 
1,100

Payments to the Supplemental Executive Retirement Plan
 
834

 
830

 
2,502

 
3,995