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Pension and Other Postretirement Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans
The following table details the components of net periodic cost of our company-sponsored pension and OPEB plans for the periods presented:
 
Three Months Ended March 31,
(In thousands)
2016
 
2015
 
2016
 
2015
 
Pension Benefit Plans
 
Other Postretirement
Employee  Benefit Plans
Service cost
$
398

 
$
316

 
$
74

 
$
148

Interest cost
3,628

 
3,490

 
766

 
1,048

Expected return on plan assets
(4,883
)
 
(4,984
)
 
—

 
—

Amortization of prior service cost (credit)
5

 
18

 
(428
)
 
(545
)
Amortization of actuarial loss (gain)
2,884

 
3,083

 
(1,383
)
 
—

Net periodic cost
$
2,032

 
$
1,923

 
$
(971
)
 
$
651