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EMPLOYEE BENEFIT PLANS (Tables)
12 Months Ended
Dec. 31, 2023
EMPLOYEE BENEFIT PLANS  
Schedule of changes in accumulated postretirement benefit obligation

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December 31,

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2023

    

2022

    

Benefit obligation, beginning of year

​

$

9,961

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$

13,235

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Service cost

​

 

142

​

 

241

​

Interest cost

​

 

477

​

 

336

​

Actuarial (gain)/loss

​

 

276

​

 

(3,323)

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Benefits paid

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(539)

​

 

(528)

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Benefit obligation, end of year

​

$

10,317

​

$

9,961

​

Schedule of net periodic postretirement benefit cost (income)

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​

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2023

    

2022

    

2021

    

Service cost—benefits attributed to service during the period

​

$

142

​

$

241

​

$

270

​

Interest cost on the accumulated postretirement benefit obligation

​

 

477

​

 

336

​

 

291

​

Net amortization

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(758)

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(826)

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(1,405)

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Net periodic postretirement benefit cost (income)

​

$

(139)

​

$

(249)

​

$

(844)

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​