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BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2018
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three and six months ended June 30, 2018 and 2017 is as follows:

  
Pension Benefits
  
Post-retirement Benefits
 
   
Three Months Ended
June 30,
  
Six Months Ended
June 30,
  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
(000’s omitted)
 
2018
  
2017
  
2018
  
2017
  
2018
  
2017
  
2018
  
2017
 
Service cost
 
$
1,121
  
$
1,067
  
$
2,242
  
$
2,106
  
$
0
  
$
0
  
$
0
  
$
0
 
Interest cost
  
1,415
   
1,449
   
2,829
   
2,812
   
17
   
19
   
34
   
38
 
Expected return on plan assets
  
(3,705
)
  
(3,407
)
  
(7,410
)
  
(6,529
)
  
0
   
0
   
0
   
0
 
Amortization of unrecognized net loss
  
298
   
209
   
596
   
472
   
5
   
2
   
10
   
4
 
Amortization of prior service cost
  
(83
)
  
17
   
(165
)
  
30
   
(44
)
  
(45
)
  
(89
)
  
(89
)
Net periodic benefit cost (income)
 
$ 
(954
)
 
$ 
(665
)
 
$ 
(1,908
)
 
$ 
(1,109
)
 
$ 
(22
)
 
$ 
(24
)
 
$ 
(45
)
 
$ 
(47
)