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Pension Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Cost for Defined Benefit Pension Plans and Other Postretirement Benefit Plan
The following table sets forth information regarding the components of net periodic cost for our defined benefit pension plans and other postretirement benefit plan for the periods indicated.
 
 
Pension Benefits
 
 
 
Other Postretirement
Benefits
 
 
For the Three Months Ended March 31,
 
For the Three Months Ended March 31,
(In Thousands)
 
2017
 
 
 
2016
 
 
 
2017
 
 
 
2016
 
Service cost
 
$
—

 
 
 
$
—

 
 
 
$
490

 
 
 
$
472

 
Interest cost
 
2,430

 
 
 
2,536

 
 
 
255

 
 
 
263

 
Expected return on plan assets
 
(3,097
)
 
 
 
(3,058
)
 
 
 
—

 
 
 
—

 
Recognized net actuarial loss (gain)
 
722

 
 
 
734

 
 
 
(99
)
 
 
 
(67
)
 
Amortization of prior service cost
 
48

 
 
 
47

 
 
 
—

 
 
 
—

 
Settlement
 
61

 
 
 
—

 
 
 
—

 
 
 
—

 
Net periodic cost
 
$
164

 
 
 
$
259

 
 
 
$
646

 
 
 
$
668