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Other comprehensive income (Tables) | 3 Months Ended
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Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Reclassification adjustments | Reclassification adjustments – Information regarding amounts reclassified from accumulated other comprehensive loss to net income was as follows:
Accumulated other comprehensive loss components |  | Amounts reclassified from accumulated other comprehensive loss |  | Affected line item in consolidated statements of comprehensive income
|  | Quarter Ended March 31, |  |  |  |
(in thousands) |  | 2022 |  | 2021 |  |  |  |  |  |
Realized loss on interest rate swap |  | $ | (318) |  |  | $ | (334) |  |  |  |  |  |  | Interest expense
Tax benefit |  | 83 |  |  | 87 |  |  |  |  |  |  | Income tax provision
Realized loss on interest rate swap, net of tax |  | (235) |  |  | (247) |  |  |  |  |  |  | Net income
Amortization of postretirement benefit plan items: |  |  |  |  |  |  |  |  |  |
Prior service credit |  | 355 |  |  | 355 |  |  |  |  |  |  | Other income
Net actuarial loss |  | (225) |  |  | (407) |  |  |  |  |  |  | Other income
Total amortization |  | 130 |  |  | (52) |  |  |  |  |  |  | Other income
Tax expense |  | (77) |  |  | (31) |  |  |  |  |  |  | Income tax provision
Amortization of postretirement benefit plan items, net of tax |  | 53 |  |  | (83) |  |  |  |  |  |  | Net income
Total reclassifications, net of tax |  | $ | (182) |  |  | $ | (330) |  |  |  |  |  |  |
Accumulated other comprehensive loss | Accumulated other comprehensive loss – Changes in the components of accumulated other comprehensive loss during the quarter ended March 31, 2022 were as follows:
(in thousands) |  | Postretirement benefit plans |  | Net unrealized loss on available-for-sale debt securities(1) |  | Net unrealized loss on cash flow hedge(2) |  | Currency translation adjustment |  | Accumulated other comprehensive loss
Balance, December 31, 2021 |  | $ | (15,431) |  |  | $ | (344) |  |  | $ | (2,261) |  |  | $ | (13,456) |  |  | $ | (31,492) |
Other comprehensive (loss) income before reclassifications |  | — |  |  | (335) |  |  | 1,924 |  |  | 696 |  |  | 2,285 |
Amounts reclassified from accumulated other comprehensive loss |  | (53) |  |  | — |  |  | 235 |  |  | — |  |  | 182 |
Net current-period other comprehensive (loss) income |  | (53) |  |  | (335) |  |  | 2,159 |  |  | 696 |  |  | 2,467 |
Balance, March 31, 2022 |  | $ | (15,484) |  |  | $ | (679) |  |  | $ | (102) |  |  | $ | (12,760) |  |  | $ | (29,025) |
(1) Other comprehensive loss before reclassifications is net of an income tax benefit of $116. (2) Other comprehensive income before reclassifications is net of income tax expense of $679.

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