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COMPONENTS OF PENSION AND OTHER POST-EMPLOYMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service Cost
$
288

 
$
759

 
$
575

 
$
1,518

 
$
—

 
$
—

 
$
—

 
$
—

Interest Cost
5,876

 
6,121

 
11,752

 
12,242

 
4,677

 
5,986

 
9,353

 
11,972

Expected Return on Plan Assets
(10,092
)
 
(10,596
)
 
(20,185
)
 
(21,191
)
 
—

 
—

 
—

 
—

Amortization of Prior Service Credits
(126
)
 
(60
)
 
(251
)
 
(120
)
 
(601
)
 
(601
)
 
(1,202
)
 
(1,203
)
Amortization of Actuarial Loss
2,179

 
1,955

 
4,358

 
3,910

 
4,051

 
5,778

 
8,102

 
11,556

Net Periodic Benefit (Credit) Cost
$
(1,875
)
 
$
(1,821
)
 
$
(3,751
)
 
$
(3,641
)
 
$
8,127

 
$
11,163

 
$
16,253

 
$
22,325