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Pension and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost (Income)
Components of net periodic benefit cost (income) were as follows: 
 Pension BenefitsPostretirement Benefits
 Three months ended September 30,
(in thousands)2021202020212020
Components of net periodic benefit cost (income)    
Service cost$2,039 $2,402 $168 $150 
Interest cost2,016 2,194 75 108 
Expected return on plan assets(2,463)(2,577)— — 
Settlement expense531 1,241 — — 
Amortization of net loss (gain)845 1,356 (80)(241)
Amortization of prior service cost (credit)69 70 (35)(35)
Net periodic benefit cost (income)$3,037 $4,686 $128 $(18)
Components of net periodic benefit cost (income) were as follows: 
 Pension BenefitsPostretirement Benefits
 Nine months ended September 30,
(in thousands)2021202020212020
Components of net periodic benefit cost (income)    
Service cost$6,166 $7,180 $503 $450 
Interest cost6,161 7,244 226 324 
Expected return on plan assets(7,409)(8,382)— — 
Settlement expense2,068 5,091 — — 
Amortization of net loss (gain)2,961 3,663 (240)(725)
Amortization of prior service cost (credit)210 209 (103)(103)
Net periodic benefit cost (income)$10,157 $15,005 $386 $(54)