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COMPONENTS OF PENSION AND OTHER POST-EMPLOYMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit (Credit) Cost
Components of Net Periodic Benefit (Credit) Cost are as follows:
 
Pension Benefits
 
Other Post-Employment Benefits
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service Cost
$
288

 
$
759

 
$
863

 
$
2,277

 
$
—

 
$
—

 
$
—

 
$
—

Interest Cost
5,876

 
6,121

 
17,628

 
18,363

 
4,677

 
5,986

 
14,030

 
17,958

Expected Return on Plan Assets
(10,092
)
 
(10,596
)
 
(30,277
)
 
(31,787
)
 
—

 
—

 
—

 
—

Amortization of Prior Service Credits
(126
)
 
(60
)
 
(377
)
 
(180
)
 
(601
)
 
(601
)
 
(1,804
)
 
(1,804
)
Amortization of Actuarial Loss
2,179

 
1,955

 
6,537

 
5,865

 
4,051

 
5,778

 
12,154

 
17,334

Net Periodic Benefit (Credit) Cost
$
(1,875
)
 
$
(1,821
)
 
$
(5,626
)
 
$
(5,462
)
 
$
8,127

 
$
11,163

 
$
24,380

 
$
33,488