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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Table)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016 were as follows:

 
Three Months Ended
 
Six Months Ended
(In thousands)
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
6,474

 
$
6,248

 
$
12,945

 
$
12,485

Interest cost
6,236

 
7,709

 
12,455

 
15,412

Expected return on plan assets
(13,310
)
 
(13,590
)
 
(26,595
)
 
(27,171
)
Amortization of prior service cost
(26
)
 
(11
)
 
(51
)
 
(23
)
Amortization of unrecognized actuarial loss
3,585

 
3,093

 
7,166

 
6,186

Net periodic benefit cost
$
2,959


$
3,449


$
5,920


$
6,889