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COMPONENTS OF PENSION AND OTHER POST-EMPLOYMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
COMPONENTS OF PENSION AND OTHER POST-EMPLOYMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS COMPONENTS OF PENSION AND OTHER POST-EMPLOYMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS:

The components of Net Periodic Benefit (Credit) Cost are as follows:
 
Pension Benefits
 
Other Post-Employment Benefits
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service Cost
$
987

 
$
288

 
$
1,975

 
$
575

 
$
—

 
$
—

 
$
—

 
$
—

Interest Cost
6,275

 
5,876

 
12,551

 
11,752

 
4,580

 
4,677

 
9,160

 
9,353

Expected Return on Plan Assets
(10,114
)
 
(10,092
)
 
(20,229
)
 
(20,185
)
 
—

 
—

 
—

 
—

Amortization of Prior Service Credits
(92
)
 
(126
)
 
(183
)
 
(251
)
 
(601
)
 
(601
)
 
(1,203
)
 
(1,202
)
Amortization of Actuarial Loss
1,490

 
2,179

 
2,979

 
4,358

 
2,315

 
4,051

 
4,631

 
8,102

Net Periodic Benefit (Credit) Cost
$
(1,454
)
 
$
(1,875
)
 
$
(2,907
)
 
$
(3,751
)
 
$
6,294

 
$
8,127

 
$
12,588

 
$
16,253



Expenses (credits) related to pension and other post-employment benefits are reflected in Operating and Other Costs in the Consolidated Statements of Income.