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RETIREMENT PLANS (Tables)
9 Months Ended
Sep. 30, 2019
RETIREMENT PLANS  
Schedule of components of the plan's net periodic pension cost

Three months ended

    

September 30, 2019

    

September 30, 2018

Pension benefits

Postretirement benefits

Pension benefits

Postretirement benefits

Operating expense

Service cost

$

447

$

37

$

448

$

37

Non-operating expense

Interest cost

841

40

820

40

Expected return on plan assets

 

(1,263)

 

 

(1,209)

 

Actuarial gain/ loss

7

(17)

30

(17)

Net periodic pension expense

$

32

$

60

$

89

$

60

Nine months ended

September 30, 2019

    

September 30, 2018

Pension benefits

Postretirement benefits

Pension benefits

Postretirement benefits

Operating expense

Service cost

$

1,342

$

111

$

1,345

$

111

Non-operating expense

Interest cost

2,524

120

2,459

120

Expected return on plan assets

 

(3,790)

 

 

(3,627)

 

Actuarial gain/ loss

22

(51)

91

(51)

Net periodic pension expense

$

98

$

180

$

268

$

180