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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
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 March 31,
 
Defined Benefit 
Pension Plan
 
Post-Retirement 
Medical Plan
 
Supplemental Executive
Retirement Plan
 
Total
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Components of net periodic cost (benefit):
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Service cost
$
1,509

 
$
1,174

 
$
264

 
$
206

 
$
70

 
$
205

 
$
1,843

 
$
1,585

Interest cost
5,997

 
5,738

 
126

 
130

 
531

 
697

 
6,654

 
6,565

Expected return on plan assets
(7,087
)
 
(7,319
)
 
—

 
—

 
—

 
—

 
(7,087
)
 
(7,319
)
Amortization of unrecognized prior service costs (benefits)
3

 
13

 
(417
)
 
(426
)
 
233

 
233

 
(181
)
 
(180
)
Amortization of losses (gains) from earlier periods
3,106

 
645

 
(157
)
 
(130
)
 
166

 
92

 
3,115

 
607

Net periodic cost (benefit)
$
3,528

 
$
251

 
$
(184
)
 
$
(220
)
 
$
1,000

 
$
1,227

 
$
4,344

 
$
1,258

 
 
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 March 31,
 
2015
 
2014
Contributions to the Defined Benefit Pension Plan
$
—

 
$
2,024

Payments to the Post-Retirement Medical Plan
133

 
131

Payments to the Supplemental Executive Retirement Plan
2,335

 
908