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Pension and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
Components of net periodic benefit cost (income) were as follows: 
Pension BenefitsPostretirement Benefits
Three months ended June 30,
(in thousands)2020201920202019
Components of net periodic benefit cost (income)
Service cost$2,462  $1,880  $129  $126  
Interest cost2,538  2,808  104  140  
Expected return on plan assets(2,902) (3,257) —  —  
Settlement expense3,850  1,775  —  —  
Amortization of net loss (gain)1,343  129  (270) (355) 
Amortization of prior service cost (credit)69  48  (34) (34) 
Net periodic benefit cost (income)$7,360  $3,383  $(71) $(123) 
Components of net periodic benefit cost (income) were as follows: 
 Pension BenefitsPostretirement Benefits
 Six months ended June 30,
(in thousands)2020201920202019
Components of net periodic benefit cost (income)    
Service cost$4,778  $4,122  $300  $287  
Interest cost5,050  5,788  216  278  
Expected return on plan assets(5,805) (6,556) —  —  
Settlement expense3,850  1,775  —  —  
Amortization of net loss (gain)2,307  401  (484) (718) 
Amortization of prior service cost (credit)139  92  (68) (68) 
Net periodic benefit cost (income)$10,319  $5,622  $(36) $(221) 
The non-service cost components of net periodic benefit cost (income) are included in other expense (income), net in the unaudited condensed consolidated statements of operations.