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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 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
$
1,335

 
$
1,509

 
$
293

 
$
264

 
$
73

 
$
70

 
$
1,701

 
$
1,843

Interest cost
6,282

 
5,997

 
175

 
126

 
444

 
531

 
6,901

 
6,654

Expected return on plan assets
(6,278
)
 
(7,087
)
 
—

 
—

 
—

 
—

 
(6,278
)
 
(7,087
)
Amortization of unrecognized prior service costs (benefits)
—

 
3

 
(276
)
 
(417
)
 
125

 
233

 
(151
)
 
(181
)
Amortization of losses (gains) from earlier periods
2,485

 
3,106

 
(85
)
 
(157
)
 
(15
)
 
166

 
2,385

 
3,115

Net periodic cost (benefit)
$
3,824

 
$
3,528

 
$
107

 
$
(184
)
 
$
627

 
$
1,000

 
$
4,558

 
$
4,344

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 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
$
2,670

 
$
3,017

 
$
586

 
$
528

 
$
146

 
$
141

 
$
3,402

 
$
3,686

Interest cost
12,564

 
11,994

 
350

 
253

 
888

 
1,061

 
13,802

 
13,308

Expected return on plan assets
(12,556
)
 
(14,174
)
 
—

 
—

 
—

 
—

 
(12,556
)
 
(14,174
)
Amortization of unrecognized prior service costs (benefits)
—

 
7

 
(552
)
 
(835
)
 
250

 
466

 
(302
)
 
(362
)
Amortization of losses (gains) from earlier periods
4,970

 
6,212

 
(170
)
 
(315
)
 
(30
)
 
332

 
4,770

 
6,229

Net periodic cost (benefit)
$
7,648

 
$
7,056

 
$
214

 
$
(369
)
 
$
1,254

 
$
2,000

 
$
9,116

 
$
8,687
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 June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
Payments to the Post-Retirement Medical Plan
 
187

 
391

 
391

 
524

Payments to the Supplemental Executive Retirement Plan
 
834

 
830

 
1,668

 
3,165