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Components of Net Periodic Benefit Cost (Tables)
6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost (Increase) for the three and six months ended June 30, 2023 and 2022 includes the following components (in thousands):
Three months ended June 30,Six months ended June 30,
Pension benefitsOther post-retirement benefitsPension benefitsOther post-retirement benefits
20232022202320222023202220232022
Service cost$— — $— — 14 
Interest cost302 214 150 111 604 428 300 222 
Expected return on plan assets(706)(864)— — (1,412)(1,728)— — 
Amortization of prior service cost— — — — — — — — 
Amortization of the net loss (gain)177 — (533)(326)354 — (1,066)(652)
Net periodic (decrease) increase in benefit cost$(227)(650)(380)(208)$(454)(1,300)(760)(416)