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EMPLOYEE BENEFIT PLANS (Tables)
12 Months Ended
Dec. 31, 2020
EMPLOYEE BENEFIT PLANS  
Schedule of amounts recognized in accumulated other comprehensive loss (pre-tax)

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​

​

​

​

Prior service credit

    

$

(1,840)

Net actuarial gain

​

 

(1,196)

Net amount recognized in accumulated other comprehensive loss

​

$

(3,036)

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Schedule of changes in accumulated postretirement benefit obligation

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​

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​

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December 31,

​

​

    

2020

    

2019

    

Benefit obligation, beginning of year

​

$

13,743

​

$

12,451

​

Service cost

​

 

288

​

 

270

​

Interest cost

​

 

403

​

 

499

​

Actuarial (gain)/loss

​

 

(510)

​

 

922

​

Benefits paid

​

 

(437)

​

 

(399)

​

Benefit obligation, end of year

​

$

13,487

​

$

13,743

​

​

The actuarial (gain) in 2020 is attributable to updated participation rates and participant spending as well as mortality table projections partially offset by an actuarial loss due to the decrease in discount rate for the year ended December 31, 2020. The actuarial loss in 2019 is attributable to a decrease in the discount rate partially offset by a change in the mortality table for year ended December 31, 2019.

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Schedule of net periodic postretirement benefit cost (income)

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​

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​

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2020

    

2019

    

2018

    

Service cost—benefits attributed to service during the period

​

$

288

​

$

270

​

$

337

​

Interest cost on the accumulated postretirement benefit obligation

​

 

403

​

 

499

​

 

455

​

Net amortization

​

 

(1,349)

​

 

(1,522)

​

 

(1,324)

​

Net periodic postretirement benefit cost (income)

​

$

(658)

​

$

(753)

​

$

(532)

​

​