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PENSION AND POSTRETIREMENT PLANS
 3 Months Ended
Mar. 31, 2017
Pension and Other Postretirement Benefit Expense [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, 2017 and 2016 is presented below (in thousands):
 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended 
 March 31,
 
Three Months Ended 
 March 31,
 
2017
 
2016
 
2017
 
2016
Service cost
$
487

 
$
559

 
$
3

 
$
3

Interest cost
1,498

 
1,672

 
18

 
19

Expected return on plan assets
(2,110
)
 
(2,309
)
 
—

 
—

Amortization of prior service credit
(76
)
 
(63
)
 
—

 
—

Amortization of transition asset
—

 
(77
)
 
—

 
—

Amortization of actuarial loss (gain)
932

 
943

 
(11
)
 
(14
)
Net periodic cost
$
731

 
$
725

 
$
10

 
$
8