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Retirement Plans (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Retirement Plans [Abstract]          
Service period of participants not impacted by pension plan amendment       15 years  
Age of plan participants not impacted by pension plan amendment       50 years  
Service period of participants who are age fifty not impacted by pension plan amendment       10 years  
Pension plan defined benefit plan cost increase limit percentage       4.00%  
Higman [Member] | Plan 2019 [Member]          
Retirement Plans [Abstract]          
Pension contributions       $ 797,000  
Higman [Member] | Plan 2020 [Member]          
Retirement Plans [Abstract]          
Pension contributions       958,000  
Higman [Member] | Plan 2020 [Member] | Subsequent Event [Member]          
Retirement Plans [Abstract]          
Pension contributions $ 480,000        
Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost   $ 1,917,000 $ 1,841,000 5,753,000 $ 5,523,000
Interest cost   3,919,000 4,123,000 11,758,000 12,370,000
Expected return on plan assets   (5,960,000) (5,239,000) (17,883,000) (15,717,000)
Amortization of actuarial (loss) gain   994,000 359,000 1,651,000 1,078,000
Net periodic benefit cost   870,000 1,084,000 1,279,000 3,254,000
SERP [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost   0 0 0 0
Interest cost   10,000 13,000 30,000 39,000
Expected return on plan assets   0 0 0 0
Amortization of actuarial (loss) gain   8,000 7,000 26,000 21,000
Net periodic benefit cost   18,000 20,000 56,000 60,000
Other Postretirement Benefits [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost   0 0 0 0
Interest cost   6,000 7,000 17,000 23,000
Amortization of actuarial (loss) gain   (131,000) (135,000) (392,000) (405,000)
Net periodic benefit cost   $ (125,000) $ (128,000) $ (375,000) $ (382,000)