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Other comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
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 (loss) was as follows:
Accumulated other comprehensive loss components |  | Amounts reclassified from accumulated other comprehensive loss |  | Affected line item in consolidated statements of comprehensive income (loss)
|  | Quarter Ended March 31, |  |  |  |
(in thousands) |  | 2021 |  | 2020 |  |  |  |  |  |
Realized (loss) gain on interest rate swap |  | $ | (334) |  |  | $ | 93 |  |  |  |  |  |  | Interest expense
Tax benefit (expense) |  | 87 |  |  | (24) |  |  |  |  |  |  | Income tax (provision) benefit
Realized (loss) gain on interest rate swap, net of tax |  | (247) |  |  | 69 |  |  |  |  |  |  | Net income (loss)
Amortization of postretirement benefit plan items: |  |  |  |  |  |  |  |  |  |
Prior service credit |  | 355 |  |  | 355 |  |  |  |  |  |  | Other income
Net actuarial loss |  | (407) |  |  | (575) |  |  |  |  |  |  | Other income
Total amortization |  | (52) |  |  | (220) |  |  |  |  |  |  | Other income
Tax (expense) benefit |  | (31) |  |  | 12 |  |  |  |  |  |  | Income tax (provision) benefit
Amortization of postretirement benefit plan items, net of tax |  | (83) |  |  | (208) |  |  |  |  |  |  | Net income (loss)
Total reclassifications, net of tax |  | $ | (330) |  |  | $ | (139) |  |  |  |  |  |  |
Accumulated other comprehensive loss | Accumulated other comprehensive loss – Changes in the components of accumulated other comprehensive loss during the quarter ended March 31, 2021 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, 2020 |  | $ | (21,956) |  |  | $ | (90) |  |  | $ | (5,351) |  |  | $ | (14,036) |  |  | $ | (41,433) |
Other comprehensive (loss) income before reclassifications |  | — |  |  | (204) |  |  | 477 |  |  | 1,006 |  |  | 1,279 |
Amounts reclassified from accumulated other comprehensive loss |  | 83 |  |  | — |  |  | 247 |  |  | — |  |  | 330 |
Net current-period other comprehensive income (loss) |  | 83 |  |  | (204) |  |  | 724 |  |  | 1,006 |  |  | 1,609 |
Balance, March 31, 2021 |  | $ | (21,873) |  |  | $ | (294) |  |  | $ | (4,627) |  |  | $ | (13,030) |  |  | $ | (39,824) |
(1) Other comprehensive loss before reclassifications is net of an income tax benefit of $71. (2) Other comprehensive income before reclassifications is net of income tax expense of $168.

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