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Defined Benefit Post-Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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 446 435 892 870
Interest cost 809 981 1,618 1,962
Expected return on plan assets (2,105) (1,873) (4,210) (3,746)
Net amortization 368 639 736 1,278
Total net periodic (benefit) cost (482) 182 (964) 364
Other Benefits [Member]        
Components of net periodic (benefit) cost [Abstract]        
Service cost 2 2 4 4
Interest cost 55 81 110 162
Expected return on plan assets 0 0 0 0
Net amortization 13 18 26 35
Total net periodic (benefit) cost $ 70 $ 101 $ 140 $ 201