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Retirement Plans and Related Post Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2019
SERP  
Reconciliation of Beginning and Ending Balances of Projected Benefit Obligation
The reconciliation of the beginning and ending balances of the projected benefit obligation of the plans for the years ended December 31 is as follows:
(In thousands)20192018
Funded Status
Projected Benefit Obligation
Beginning of the Year — January 1$21,970  $25,141  
Service Cost181  200  
Interest Cost916  899  
Actuarial Loss (Gain)3,827  (3,922) 
Benefits Paid(347) (348) 
End of the Year — December 31$26,547  $21,970  
Assumptions Used to Calculate the Post Retirement Benefit Obligation
The assumptions used to calculate the projected benefit obligation as of December 31 are as follows:
20192018
Discount Rate3.17%  4.20%  
Future Average Compensation Increases2.00%  2.00%  
Summary of the Components of Net Periodic Cost
The following table summarizes the components of the net periodic cost for the years ended December 31:
(In thousands)201920182017
Net Periodic Cost
Service Cost — Benefits Earned During Period$181  $200  $186  
Interest Cost916  899  897  
Amortization of Prior Service Cost386  386  387  
Amortization of Losses300  629  369  
Net Periodic Cost$1,783  $2,114  $1,839  
Assumptions Used to Determine the Net Periodic Cost
The assumptions used to determine the net periodic cost are as follows:
201920182017
Discount Rate4.20%  3.60%  4.20%  
Future Average Compensation Increases2.00%  
2.00% - 3.00%
3.00% - 5.00%
SERP Medical  
Reconciliation of Beginning and Ending Balances of Projected Benefit Obligation
The reconciliation of the beginning and ending balances of the accumulated postretirement benefit obligation for the years ended December 31, is as follows:
(In thousands)20192018
Funded Status
Accumulated Postretirement Benefit Obligation
Beginning of the Year — January 1$1,136  $1,307  
Service Cost13  16  
Interest Cost46  46  
Actuarial Gain(28) (162) 
Benefits Paid(63) (71) 
End of the Year — December 31$1,104  $1,136  
Assumptions Used to Calculate the Post Retirement Benefit Obligation
The assumptions used to calculate the accumulated post-retirement benefit obligation as of December 31 are as follows:
20192018
Discount Rate3.17%  4.20%  
Summary of the Components of Net Periodic Cost
The following table summarizes the components of the net periodic cost for the years ended December 31 as follows:
(In thousands)201920182017
Net Periodic Cost
Service Cost — Benefits Earned During Period$13  $16  $7  
Interest Cost46  46  41  
Amortization of Prior Service Cost16  16  16  
Amortization of Losses43  59  31  
Net Periodic Cost$118  $137  $95  
Assumptions Used to Determine the Net Periodic Cost
The assumptions used to determine the net periodic cost are as follows:
201920182017
Discount Rate4.20%  3.60%  4.20%  
Future Average Healthcare Benefit Increases4.98%  5.38%  5.50%