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Components of Net Periodic Benefit Cost (Tables)
9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost (Increase)
Net periodic (decrease) increase in benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2020 and 2019 includes the following components (in thousands):
Three months ended September 30,Nine months ended September 30,
Pension benefitsOther post-retirement benefitsPension benefitsOther post-retirement benefits
20202019202020192020201920202019
Service cost$— — 19 20 $— — 59 60 
Interest cost250 299 178 209 750 899 534 628 
Expected return on plan assets(737)(640)— — (2,211)(1,922)— — 
Amortization of prior service cost— — — — — — — — 
Amortization of the net loss (gain)174 254 (62)(206)522 762 (186)(620)
Net periodic (decrease) increase in benefit cost$(313)(87)135 23 $(939)(261)407 68