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Defined Benefit Post-Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Post-Retirement Plans [Abstract]        
Employer contributions $ 0 $ 0 $ 0 $ 0
Pension Benefits [Member]        
Components of net periodic (benefit) cost [Abstract]        
Service cost 446 431 1,338 1,301
Interest cost 809 986 2,427 2,948
Expected return on plan assets (2,105) (1,869) (6,315) (5,615)
Net amortization 368 658 1,104 1,936
Total net periodic (benefit) cost (482) 206 (1,446) 570
Other Benefits [Member]        
Components of net periodic (benefit) cost [Abstract]        
Service cost 2 1 6 5
Interest cost 55 67 165 229
Expected return on plan assets 0 0 0 0
Net amortization 13 14 39 49
Total net periodic (benefit) cost $ 70 $ 82 $ 210 $ 283