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COMPONENTS OF PENSION AND OTHER POSTRETIREMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service Cost
$
759

 
$
389

 
$
2,277

 
$
1,166

 
$
—

 
$
—

 
$
—

 
$
—

Interest Cost
6,121

 
5,576

 
18,363

 
18,621

 
5,986

 
6,060

 
17,958

 
18,181

Expected Return on Plan Assets
(10,596
)
 
(11,195
)
 
(31,787
)
 
(34,933
)
 
—

 
—

 
—

 
—

Amortization of Prior Service Credits
(60
)
 
(60
)
 
(180
)
 
(180
)
 
(601
)
 
—

 
(1,804
)
 
—

Recognized Net Actuarial Loss
1,955

 
2,360

 
5,865

 
5,826

 
5,778

 
4,792

 
17,334

 
14,376

Settlement Loss
—

 
3,651

 
—

 
17,347

 
—

 
—

 
—

 
—

Net Periodic Benefit (Credit) Cost
$
(1,821
)
 
$
721

 
$
(5,462
)
 
$
7,847

 
$
11,163

 
$
10,852

 
$
33,488

 
$
32,557