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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Pension Plan [Member]    
Expected employer contributions [Abstract]    
First year $ 8,374 $ 145
Expected benefit payments (gross) [Abstract]    
Year one 16,312 15,480
Year two 16,899 16,678
Year three 17,808 17,598
Year four 18,650 18,382
Year five 19,707 19,127
Next five years 110,417 109,845
SERP [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 108 130
Year two 104 104
Year three 99 100
Year four 94 96
Year five 90 91
Next five years 359 381
Other Postretirement Benefits [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 50 50
Year two 49 49
Year three 47 48
Year four 45 47
Year five 43 45
Next five years $ 176 $ 194