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Postretirement benefits
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
Postretirement benefits
We have historically provided certain health care benefits for a large number of retired U.S. employees. In addition to our retiree health care plan, we also have a U.S. supplemental executive retirement plan. Further information regarding our postretirement benefit plans can be found under the caption “Note 14: Postretirement Benefits” in the Notes to Consolidated Financial Statements appearing in the 2019 Form 10-K.

Postretirement benefit income is included in other income on the consolidated statements of comprehensive (loss) income and consisted of the following components:
 
 
Quarter Ended
March 31,
(in thousands)
 
2020
 
2019
Interest cost
 
$
478

 
$
682

Expected return on plan assets
 
(1,905
)
 
(1,740
)
Amortization of prior service credit
 
(355
)
 
(355
)
Amortization of net actuarial losses
 
575

 
806

Net periodic benefit income
 
$
(1,207
)
 
$
(607
)