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Pension and Other Post-retirement Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension benefits        
Components of net periodic benefit cost        
Service cost $ 1,487 $ 1,716 $ 4,462 $ 5,148
Interest cost 1,839 1,678 5,515 5,034
Expected return on plan assets (2,759) (2,992) (8,278) (8,976)
Amortization of prior service cost (581) (581) (1,742) (1,742)
Amortization of the net loss 856 872 2,568 2,617
Net periodic cost 842 693 2,525 2,081
Pension benefits | Minimum        
Components of net periodic benefit cost        
Estimated contribution for the current year 2,000   2,000  
Pension benefits | Maximum        
Components of net periodic benefit cost        
Estimated contribution for the current year 4,000   4,000  
Other post-retirement benefits        
Components of net periodic benefit cost        
Service cost 0 0 0 0
Interest cost 13 14 39 41
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of the net loss 17 24 51 73
Net periodic cost $ 30 $ 38 $ 90 $ 114