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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
 
The components of net periodic benefit cost for the Company’s defined benefit and other postretirement plans included the following: 
 
 
Three months ended September 30,
 
Nine months ended September 30,
Components of Net Period Benefit Cost
 
2016
 
2015
 
2016
 
2015
 
 
(in thousands)
Service cost
 
$
3,438

 
$
4,006

 
$
10,864

 
$
12,456

Interest cost
 
7,518

 
7,454

 
22,682

 
22,232

Expected return on plan assets
 
(4,472
)
 
(4,702
)
 
(13,416
)
 
(14,134
)
Recognized net actuarial loss
 
2,008

 
3,012

 
5,952

 
8,486

Net periodic benefit cost
 
$
8,492

 
$
9,770

 
$
26,082

 
$
29,040


 
The Company contributed $15.6 million and $26.9 million to its defined benefit and other postretirement plans during the three and nine months ended September 30, 2016, respectively, including $21.2 million above the minimum funding requirements. The Company contributed $3.2 million and $16.7 million to its defined benefit and other postretirement plans during the three and nine months ended September 30, 2015, respectively.