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Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
Components of net periodic benefit cost were as follows: 
 Pension BenefitsPostretirement Benefits
 Three months ended March 31,
(in thousands)2022202120222021
Components of net periodic benefit cost    
Service cost$2,007 $2,135 $160 $162 
Interest cost2,234 1,951 84 75 
Expected return on plan assets(1,871)(2,547)— — 
Settlement expense— 1,419 — — 
Amortization of net loss (gain)935 1,421 (152)(65)
Amortization of prior service cost (credit)69 71 (34)(34)
Net periodic benefit cost$3,374 $4,450 $58 $138