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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost (Increase) Net periodic (benefit) increase cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2021 and 2020 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
20212020202120202021202020212020
Service cost$— — 8 19 $— — 26 59 
Interest cost198 250 106 178 594 750 318 534 
Expected return on plan assets(807)(737)— — (2,421)(2,211)— — 
Amortization of prior service cost— — — — — — — — 
Amortization of the net loss (gain)118 174 (267)(62)354 522 (803)(186)
Net periodic (decrease) increase in benefit cost$(491)(313)(153)135 $(1,473)(939)(459)407