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Postretirement benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
Components of net periodic benefit income
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
)