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PENSION AND POSTRETIREMENT PLANS
 6 Months Ended
Jun. 30, 2017
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 and six months ended June 30, 2017 and 2016 is presented below (in thousands):
 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended 
 June 30,
 
Three Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
487

 
$
569

 
$
3

 
$
3

Interest cost
1,504

 
1,676

 
18

 
19

Expected return on plan assets
(2,126
)
 
(2,328
)
 
—

 
—

Amortization of prior service credit
(78
)
 
(64
)
 
—

 
—

Amortization of transition asset
—

 
(79
)
 
—

 
—

Amortization of actuarial loss (gain)
935

 
957

 
(11
)
 
(14
)
Settlement loss (gain)
30

 
—

 
—

 
—

Net periodic cost
$
752


$
731


$
10


$
8

 
 
 
 
 
 
 
 
 
Pension Benefits
 
Postretirement Benefits
 
Six Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
974

 
$
1,128

 
$
6

 
$
6

Interest cost
3,002

 
3,348

 
36

 
38

Expected return on plan assets
(4,236
)
 
(4,637
)
 
—

 
—

Amortization of prior service credit
(154
)
 
(127
)
 
—

 
—

Amortization of transition asset
—

 
(156
)
 
—

 
—

Amortization of actuarial loss (gain)
1,867

 
1,900

 
(22
)
 
(28
)
Settlement loss (gain)
30

 
—

 
—

 
—

Net periodic cost
$
1,483

 
$
1,456

 
$
20

 
$
16