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Pension and Postretirement Benefits - Composition of Net Periodic Pension Plan and Postretirement Plan Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Pension Benefits [Member]    
Composition of Net Periodic Benefit Plan Cost [Abstract]    
Interest cost $ 116 $ 124
Expected return on plan assets (273) (234)
Amortization of net losses 57 82
Net periodic benefit plan (benefit) cost (100) (28)
Postretirement Benefits [Member]    
Composition of Net Periodic Benefit Plan Cost [Abstract]    
Interest cost 4 5
Amortization of prior service credits (1) (1)
Amortization of net losses 2 3
Net periodic benefit plan (benefit) cost $ 5 $ 7