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Components of Net Periodic Benefit Cost (Tables)
6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Net Periodic (Benefit) Increase Cost
Net periodic (benefit) increase cost for pension benefits and other post-retirement benefits for the three and six months ended June 30, 2024 and 2023 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
20242023202420232024202320242023
Service cost$— — $— — 
Interest cost289 302 135 150 578 604 270 300 
Expected return on plan assets(778)(706)— — (1,556)(1,412)— — 
Amortization of prior service cost— — — — — — — — 
Amortization of the net loss (gain)14 177 (530)(533)28 354 (1,060)(1,066)
Net periodic (decrease) increase in benefit cost$(475)(227)(392)(380)$(950)(454)(784)(760)