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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member]    
Expected employer contributions [Abstract]    
First year $ 2,407 $ 2,395
Expected benefit payments (gross) [Abstract]    
Year one 12,063 12,209
Year two 13,123 13,108
Year three 14,300 13,959
Year four 15,572 14,959
Year five 16,857 16,052
Next five years 100,587 96,547
SERP [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 162 162
Year two 158 159
Year three 133 155
Year four 107 130
Year five 103 104
Next five years 426 447
Other Postretirement Benefits [Member]    
Expected employer contributions [Abstract]    
First year 0 0
Expected benefit payments (gross) [Abstract]    
Year one 61 66
Year two 62 68
Year three 51 69
Year four 51 57
Year five 49 56
Next five years $ 220 $ 261