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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Pension Plan [Member]    
Expected employer contributions [Abstract]    
First year $ 145 $ 2,385
Expected benefit payments (gross) [Abstract]    
Year one 15,480 13,902
Year two 16,678 14,902
Year three 17,598 16,123
Year four 18,382 17,284
Year five 19,127 18,315
Next five years 109,845 106,400
SERP [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 130 162
Year two 104 136
Year three 100 110
Year four 96 106
Year five 91 101
Next five years 381 406
Other Postretirement Benefits [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 50 59
Year two 49 49
Year three 48 48
Year four 47 47
Year five 45 46
Next five years $ 194 $ 202