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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Pension Plan [Member]    
Expected employer contributions [Abstract]    
First year $ 1,770 $ 8,374
Expected benefit payments (gross) [Abstract]    
Year one 16,696 16,312
Year two 17,513 16,899
Year three 18,169 17,808
Year four 19,096 18,650
Year five 19,860 19,707
Next five years 108,717 110,417
SERP [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 108 108
Year two 103 104
Year three 98 99
Year four 93 94
Year five 88 90
Next five years 337 359
Other Postretirement Benefits [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 47 50
Year two 46 49
Year three 44 47
Year four 43 45
Year five 41 43
Next five years $ 167 $ 176