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Pension and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 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 Benefits
 
Postretirement Benefits
 
 
Three months ended March 31,
(in thousands)
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost (income)
 
 
 
 
 
 
 
 
Service cost
 
$
2,316

 
$
2,242

 
$
171

 
$
161

Interest cost
 
2,512

 
2,980

 
112

 
138

Expected return on plan assets
 
(2,903
)
 
(3,299
)
 
—

 
—

Amortization of net loss (gain)
 
964

 
272

 
(214
)
 
(363
)
Amortization of prior service cost (credit)
 
70

 
44

 
(34
)
 
(34
)
Net periodic benefit cost (income)
 
$
2,959

 
$
2,239

 
$
35

 
$
(98
)

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.