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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
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 September 30,
 
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
$
2,170

 
$
3,417

 
$
378

 
$
349

 
$
(4
)
 
$
73

 
$
2,544

 
$
3,839

Interest cost
6,114

 
6,384

 
192

 
184

 
405

 
444

 
6,711

 
7,012

Expected return on plan assets
(4,980
)
 
(6,237
)
 
—

 
—

 
—

 
—

 
(4,980
)
 
(6,237
)
Amortization of unrecognized prior service costs (benefits)
—

 
—

 
(235
)
 
(275
)
 
126

 
125

 
(109
)
 
(150
)
Amortization of losses (gains) from earlier periods
2,241

 
2,726

 
75

 
(67
)
 
(14
)
 
(15
)
 
2,302

 
2,644

Net periodic cost (benefit)
$
5,545

 
$
6,290

 
$
410

 
$
191

 
$
513

 
$
627

 
$
6,468

 
$
7,108

 
Nine Months Ended September 30,
 
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
$
1,436

 
$
6,087

 
$
1,092

 
$
935

 
$
(12
)
 
$
219

 
$
2,516

 
$
7,241

Interest cost
18,356

 
18,948

 
568

 
534

 
1,215

 
1,332

 
20,139

 
20,814

Expected return on plan assets
(15,216
)
 
(18,793
)
 
—

 
—

 
—

 
—

 
(15,216
)
 
(18,793
)
Amortization of unrecognized prior service costs (benefits)
—

 
—

 
(339
)
 
(827
)
 
376

 
375

 
37

 
(452
)
Amortization of losses (gains) from earlier periods
6,639

 
7,695

 
(151
)
 
(237
)
 
(40
)
 
(44
)
 
6,448

 
7,414

Net periodic cost (benefit)
$
11,215

 
$
13,937

 
$
1,170

 
$
405

 
$
1,539

 
$
1,882

 
$
13,924

 
$
16,224
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 September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Payments to the Post-Retirement Medical Plan
 
155

 
212

 
531

 
603

Payments to the Supplemental Executive Retirement Plan
 
834

 
834

 
2,502

 
2,502