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EMPLOYEE BENEFIT PLANS (Tables)
12 Months Ended
Dec. 31, 2021
EMPLOYEE BENEFIT PLANS  
Schedule of amounts recognized in accumulated other comprehensive loss (pre-tax)

​

​

​

​

​

Prior service credit

    

$

(613)

Net actuarial gain

​

 

(1,341)

Net amount recognized in accumulated other comprehensive loss

​

$

(1,954)

​

Schedule of changes in accumulated postretirement benefit obligation

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​

​

​

​

​

​

​

​

​

​

December 31,

​

​

    

2021

    

2020

    

Benefit obligation, beginning of year

​

$

13,487

​

$

13,743

​

Service cost

​

 

270

​

 

288

​

Interest cost

​

 

291

​

 

403

​

Actuarial (gain)/loss

​

 

(326)

​

 

(510)

​

Benefits paid

​

 

(487)

​

 

(437)

​

Benefit obligation, end of year

​

$

13,235

​

$

13,487

​

Schedule of net periodic postretirement benefit cost (income)

​

​

​

​

​

​

​

​

​

​

​

​

​

    

2021

    

2020

    

2019

    

Service cost—benefits attributed to service during the period

​

$

270

​

$

288

​

$

270

​

Interest cost on the accumulated postretirement benefit obligation

​

 

291

​

 

403

​

 

499

​

Net amortization

​

 

(1,405)

​

 

(1,349)

​

 

(1,522)

​

Net periodic postretirement benefit cost (income)

​

$

(844)

​

$

(658)

​

$

(753)

​

​