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PENSION AND POSTRETIREMENT PLANS
 3 Months Ended
Mar. 31, 2018
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
PENSION AND POSTRETIREMENT PLANS
PENSION AND POSTRETIREMENT PLANS
 
A summary of the components of net periodic pension and postretirement benefit costs for the three months ended March 31, 2018 and 2017 is presented below (in thousands):
 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended 
 March 31,
 
Three Months Ended 
 March 31,
 
2018
 
2017
 
2018
 
2017
Service cost
$
505

 
$
487

 
$
3

 
$
3

Interest cost
1,385

 
1,498

 
16

 
18

Expected return on plan assets
(2,224
)
 
(2,110
)
 
—

 
—

Amortization of prior service credit
(81
)
 
(76
)
 
—

 
—

Amortization of transition asset
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
805

 
932

 
(10
)
 
(11
)
Settlement loss (gain)
10

 
—

 
—

 
—

Net periodic cost
$
400


$
731


$
9


$
10


The components of net periodic benefit cost other than the service cost component are included in "Other non-operating expense, net" in the Consolidated Statement of Operations.