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PENSION AND OTHER BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2014
PENSION AND OTHER BENEFITS [Abstract]  
Components of Net Periodic Benefit Cost for Pension and Other Postretirement Benefits
The following tables represent the components of net periodic benefit cost for pension and other postretirement benefits as well as the actuarial weighted-average assumptions used in calculating net periodic benefit cost for the three- and nine‑month periods ended September 30, 2014 and 2013:

  
Three Months Ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
  
2014
  
2013
  
2014
  
2013
 
  
(In Thousands)
 
Components of net periodic benefit cost:
        
Service cost
 
$
2,896
  
$
3,696
  
$
404
  
$
481
 
Interest cost
  
11,019
   
9,988
   
1,487
   
1,384
 
Expected return on plan assets
  
(13,560
)
  
(12,863
)
  
(700
)
  
(648
)
Amortization of:
                
Prior service costs
  
73
   
151
   
71
   
(13
)
Actuarial loss
  
3,097
   
5,208
   
(172
)
  
444
 
Settlements (1)
  
-
   
632
   
-
   
-
 
Net periodic benefit cost
 
$
3,525
  
$
6,812
  
$
1,090
  
$
1,648
 
 
  
Nine Months Ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
  
2014
  
2013
  
2014
  
2013
 
  
(In Thousands)
 
Components of net periodic benefit cost:
        
Service cost
 
$
8,688
  
$
11,088
  
$
1,212
  
$
1,443
 
Interest cost
  
33,057
   
29,964
   
4,461
   
4,152
 
Expected return on plan assets
  
(40,680
)
  
(38,589
)
  
(2,100
)
  
(1,944
)
Amortization of:
                
Prior service costs
  
219
   
453
   
213
   
(39
)
Actuarial loss
  
9,291
   
15,624
   
(516
)
  
1,332
 
Settlements (1)
  
-
   
632
   
-
   
-
 
Net periodic benefit cost
 
$
10,575
  
$
19,172
  
$
3,270
  
$
4,944
 
                 
  
Three and Nine Months Ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
   
2014
   
2013
   
2014
   
2013
 
                 
Discount rate
  
4.90%-5.20
%
  
4.00%-4.25
%
  
4.85%-5.20
%
  
4.00%-4.25
%
Average wage increase
  
3.50%-3.80
%
  
3.50%-3.80
%
  
N/A
 
  
N/A
 
Return on plan assets
  
7.75%-8.00
%
  
7.75%-8.00
%
  
5.56%-8.00
%
  
5.56%-8.00
%
Composite health care trend rate (current year)
  
N/A
  
N/A
 
  
7.00
%
  
7.50
%
Composite health care trend rate (2018 forward)
  
N/A
 
  
N/A
 
  
5.00
%
  
5.00
%
Weighted Average Actuarial Assumption used in Calculating Net Periodic Benefit Cost
  
Nine Months Ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
  
2014
  
2013
  
2014
  
2013
 
  
(In Thousands)
 
Components of net periodic benefit cost:
        
Service cost
 
$
8,688
  
$
11,088
  
$
1,212
  
$
1,443
 
Interest cost
  
33,057
   
29,964
   
4,461
   
4,152
 
Expected return on plan assets
  
(40,680
)
  
(38,589
)
  
(2,100
)
  
(1,944
)
Amortization of:
                
Prior service costs
  
219
   
453
   
213
   
(39
)
Actuarial loss
  
9,291
   
15,624
   
(516
)
  
1,332
 
Settlements (1)
  
-
   
632
   
-
   
-
 
Net periodic benefit cost
 
$
10,575
  
$
19,172
  
$
3,270
  
$
4,944
 
                 
  
Three and Nine Months Ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
   
2014
   
2013
   
2014
   
2013
 
                 
Discount rate
  
4.90%-5.20
%
  
4.00%-4.25
%
  
4.85%-5.20
%
  
4.00%-4.25
%
Average wage increase
  
3.50%-3.80
%
  
3.50%-3.80
%
  
N/A
 
  
N/A
 
Return on plan assets
  
7.75%-8.00
%
  
7.75%-8.00
%
  
5.56%-8.00
%
  
5.56%-8.00
%
Composite health care trend rate (current year)
  
N/A
  
N/A
 
  
7.00
%
  
7.50
%
Composite health care trend rate (2018 forward)
  
N/A
 
  
N/A
 
  
5.00
%
  
5.00
%

(1)
Reflects settlement charges resulting from a distribution to a former employee upon retirement
N/A – not applicable