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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Table)
 6 Months Ended
Jun. 30, 2018
Pension Plans Defined Benefit [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Defined Benefit Plans Disclosures
The components of net periodic pension cost for the three and six months ended June 30, 2018 and 2017 were as follows:

 
Three Months Ended
 
Six Months Ended
(In thousands)
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
6,495

 
$
6,474

 
$
13,001

 
$
12,945

Interest cost
6,521

 
6,236

 
13,055

 
12,455

Expected return on plan assets
(14,695
)
 
(13,310
)
 
(29,411
)
 
(26,595
)
Amortization of prior service cost
(62
)
 
(26
)
 
(125
)
 
(51
)
Amortization of unrecognized actuarial loss
3,903

 
3,585

 
7,809

 
7,166

Net periodic benefit cost
$
2,162


$
2,959


$
4,329


$
5,920