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Postretirement benefits (Tables)
 6 Months Ended
Jun. 30, 2019
Defined Benefit Plan [Abstract]  
Components of net periodic benefit income
Postretirement benefit income is included in other income on the consolidated statements of comprehensive income and consisted of the following components:
 
 
Quarter Ended
June 30,
 
Six Months Ended
June 30,
(in thousands)
 
2019
 
2018
 
2019
 
2018
Interest cost
 
$
682

 
$
656

 
$
1,364

 
$
1,313

Expected return on plan assets
 
(1,740
)
 
(1,934
)
 
(3,479
)
 
(3,868
)
Amortization of prior service credit
 
(355
)
 
(355
)
 
(711
)
 
(711
)
Amortization of net actuarial losses
 
806

 
721

 
1,612

 
1,442

Net periodic benefit income
 
$
(607
)
 
$
(912
)
 
$
(1,214
)
 
$
(1,824
)