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Other comprehensive income (Tables) | 3 Months Ended
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Mar. 31, 2023
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) |  | 2023 |  | 2022 |  |  |  |  |  |
Amortization of postretirement benefit plan items: |  |  |  |  |  |  |  |  |  |
Prior service credit |  | $ | 355 |  |  | $ | 355 |  |  |  |  |  |  | Other income
Net actuarial loss |  | (568) |  |  | (225) |  |  |  |  |  |  | Other income
Total amortization |  | (213) |  |  | 130 |  |  |  |  |  |  | Other income
Tax benefit (expense) |  | 16 |  |  | (77) |  |  |  |  |  |  | Income tax provision
Amortization of postretirement benefit plan items, net of tax |  | (197) |  |  | 53 |  |  |  |  |  |  | Net income
Realized gain (loss) on cash flow hedges |  | 570 |  |  | (318) |  |  |  |  |  |  | Interest expense
Tax (expense) benefit |  | (152) |  |  | 83 |  |  |  |  |  |  | Income tax provision
Realized gain (loss) on cash flow hedges, net of tax |  | 418 |  |  | (235) |  |  |  |  |  |  | Net income
Total reclassifications, net of tax |  | $ | 221 |  |  | $ | (182) |  |  |  |  |  |  |
Accumulated other comprehensive loss | Accumulated other comprehensive loss – Changes in the components of accumulated other comprehensive loss during the quarter ended March 31, 2023 were as follows:
(in thousands) |  | Postretirement benefit plans |  | Net unrealized loss on debt securities(1) |  | Net unrealized gain (loss) on cash flow hedges(2) |  | Currency translation adjustment |  | Accumulated other comprehensive loss
Balance, December 31, 2022 |  | $ | (26,872) |  |  | $ | (909) |  |  | $ | 2,593 |  |  | $ | (12,076) |  |  | $ | (37,264) |
Other comprehensive income (loss) before reclassifications |  | — |  |  | 123 |  |  | (2,872) |  |  | 227 |  |  | (2,522) |
Amounts reclassified from accumulated other comprehensive loss |  | 197 |  |  | — |  |  | (418) |  |  | — |  |  | (221) |
Net current-period other comprehensive income (loss) |  | 197 |  |  | 123 |  |  | (3,290) |  |  | 227 |  |  | (2,743) |
Balance, March 31, 2023 |  | $ | (26,675) |  |  | $ | (786) |  |  | $ | (697) |  |  | $ | (11,849) |  |  | $ | (40,007) |
(1) Other comprehensive income before reclassifications is net of income tax expense of $43. (2) Other comprehensive loss before reclassifications is net of an income tax benefit of $1,045.

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