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EMPLOYEE BENEFIT PLANS (Tables)
12 Months Ended
Dec. 31, 2019
EMPLOYEE BENEFIT PLANS  
Schedule of amounts recognized in accumulated other comprehensive loss (pre-tax)

​

​

​

​

​

Prior service credit

    

$

(3,066)

Net actuarial gain

​

 

(808)

Net amount recognized in accumulated other comprehensive loss

​

$

(3,874)

​

Schedule of changes in accumulated postretirement benefit obligation

​

​

​

​

​

​

​

​

​

​

​

December 31,

​

​

    

2019

    

2018

    

Benefit obligation, beginning of year

​

$

12,451

​

$

13,497

​

Service cost

​

 

270

​

 

337

​

Interest cost

​

 

499

​

 

455

​

Actuarial (gain)/loss

​

 

922

​

 

(1,409)

​

Benefits paid

​

 

(399)

​

 

(429)

​

Benefit obligation, end of year

​

$

13,743

​

$

12,451

​

​

​

​

​

​

Schedule of net periodic postretirement benefit cost (income)

​

​

​

​

​

​

​

​

​

​

​

​

​

    

2019

    

2018

    

2017

    

Service cost—benefits attributed to service during the period

​

$

270

​

$

337

​

$

323

​

Interest cost on the accumulated postretirement benefit obligation

​

 

499

​

 

455

​

 

468

​

Net amortization

​

 

(1,522)

​

 

(1,324)

​

 

(1,462)

​

Net periodic postretirement benefit cost (income)

​

$

(753)

​

$

(532)

​

$

(671)

​

​