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Pension and OPEB - Periodic Cost (Tables)
 3 Months Ended
Mar. 31, 2017
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS NET PERIODIC BENEFIT COSTS: [Abstract]  
Components of Net Periodic Costs
Components of Net Periodic Benefit (Credit) Cost are as follows:
 
Pension Benefits
 
Other Post-Employment Benefits
 
For the Three Months Ended March 31,
 
For the Three Months Ended March 31,
 
2017
 
2016
 
2017
 
2016
Service Cost
$
846

 
$
482

 
$
—

 
$
—

Interest Cost
6,428

 
6,841

 
5,986

 
6,060

Expected Return on Plan Assets
(10,596
)
 
(11,869
)
 
—

 
—

Amortization of Prior Service Credits
(148
)
 
(147
)
 
(601
)
 
—

Recognized Net Actuarial Loss
2,351

 
2,116

 
5,778

 
4,792

Net Periodic Benefit (Credit) Cost
$
(1,119
)
 
$
(2,577
)
 
$
11,163

 
$
10,852