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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Employee Benefit Plans
Employee Benefit Plans

Net periodic benefit income for the pension plans included the following components for the three months ended September 30:

 
Pension Benefits
 
2017
 
2016
 
(in thousands)
Service cost
$
2,240

 
$
2,106

Interest cost
24,243

 
26,195

Expected return on plan assets
(38,061
)
 
(39,296
)
Amortization of prior service credit
(88
)
 
(108
)
Amortization of actuarial loss
9,549

 
7,860

Net periodic benefit income
$
(2,117
)
 
$
(3,243
)
Net periodic benefit income for the pension plans included the following components for the nine months ended September 30:
 
 
Pension Benefits
 
2017
 
2016
 
(in thousands)
Service cost
$
6,530

 
$
6,257

Interest cost
72,474

 
78,505

Expected return on plan assets
(117,475
)
 
(117,767
)
Amortization of prior service credit
(263
)
 
(324
)
Amortization of actuarial loss
28,500

 
23,530

Net periodic benefit income
$
(10,234
)
 
$
(9,799
)


Pension benefits also include amounts related to a supplemental retirement plan. During the nine months ended September 30, 2017, the Company made a $38.7 million contribution to the pension plan.