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Employee Benefit Plans
 6 Months Ended
Jun. 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 June 30:

 
Pension Benefits
 
2017
 
2016
 
(in thousands)
Service cost
$
2,133

 
$
2,124

Interest cost
24,099

 
26,219

Expected return on plan assets
(39,681
)
 
(39,333
)
Amortization of prior service credit
(87
)
 
(108
)
Amortization of actuarial loss
9,466

 
7,875

Net periodic benefit income
$
(4,070
)
 
$
(3,223
)





Net periodic benefit income for the pension plans included the following components for the six months ended June 30:
 
 
Pension Benefits
 
2017
 
2016
 
(in thousands)
Service cost
$
4,290

 
$
4,151

Interest cost
48,231

 
52,310

Expected return on plan assets
(79,414
)
 
(78,471
)
Amortization of prior service credit
(175
)
 
(216
)
Amortization of actuarial loss
18,951

 
15,670

Net periodic benefit income
$
(8,117
)
 
$
(6,556
)


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