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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

Service cost
$
1,364

 
$
1,627

 
$
327

 
$
246

 
$
30

 
$
251

Interest cost
5,824

 
5,328

 
171

 
138

 
503

 
637

Expected return on plan assets
(7,328
)
 
(6,317
)
 
—

 
—

 
—

 
—

Amortization of unrecognized prior service costs (benefits)
12

 
13

 
(427
)
 
(413
)
 
234

 
233

Amortization of losses (gains) from earlier periods
885

 
4,212

 
(77
)
 
(55
)
 
165

 
325

Settlement
—

 
—

 
—

 
—

 
2,666

 
—

Net periodic cost (benefit)
$
757

 
$
4,863

 
$
(6
)
 
$
(84
)
 
$
3,598

 
$
1,446


 
Nine Months Ended September 30,
 
Defined Benefit Pension Plan
 
Post-Retirement Medical Plan
 
Supplemental Executive
Retirement Plan
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

Service cost
$
3,713

 
$
4,146

 
$
739

 
$
710

 
$
440

 
$
752

Interest cost
17,301

 
15,673

 
431

 
384

 
1,896

 
1,911

Expected return on plan assets
(21,966
)
 
(18,375
)
 
—

 
—

 
—

 
—

Amortization of unrecognized prior service costs (benefits)
38

 
38

 
(1,280
)
 
(1,237
)
 
700

 
699

Amortization of losses (gains) from earlier periods
2,174

 
12,001

 
(337
)
 
(262
)
 
350

 
975

Settlement
—

 
—

 
—

 
—

 
2,666

 
—

Net periodic cost (benefit)
$
1,260

 
$
13,483

 
$
(447
)
 
$
(405
)
 
$
6,052

 
$
4,337
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,
 
2014
 
2013
Contributions to the Defined Benefit Pension Plan
$
6,003

 
$
14,624

Payments to the Post-Retirement Medical Plan
178

 
109

Payments to the Supplemental Executive Retirement Plan
14,255

 
915


 
Nine Months Ended September 30,
 
2014
 
2013
Contributions to the Defined Benefit Pension Plan
$
10,717

 
$
16,649

Payments to the Post-Retirement Medical Plan
393

 
391

Payments to the Supplemental Executive Retirement Plan
16,044

 
2,775