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Other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  | Six Months Ended June 30, |  |
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |
Realized loss on interest rate swap |  | $ | (330) |  |  | $ | (281) |  |  | $ | (664) |  |  | $ | (188) |  |  | Interest expense
Tax benefit |  | 87 |  |  | 73 |  |  | 174 |  |  | 49 |  |  | Income tax provision
Realized loss on interest rate swap, net of tax |  | (243) |  |  | (208) |  |  | (490) |  |  | (139) |  |  | Net income (loss)
Amortization of postretirement benefit plan items: |  |  |  |  |  |  |  |  |  |
Prior service credit |  | 355 |  |  | 355 |  |  | 711 |  |  | 711 |  |  | Other income
Net actuarial loss |  | (407) |  |  | (575) |  |  | (814) |  |  | (1,150) |  |  | Other income
Total amortization |  | (52) |  |  | (220) |  |  | (103) |  |  | (439) |  |  | Other income
Tax (expense) benefit |  | (31) |  |  | 12 |  |  | (63) |  |  | 23 |  |  | Income tax provision
Amortization of postretirement benefit plan items, net of tax |  | (83) |  |  | (208) |  |  | (166) |  |  | (416) |  |  | Net income (loss)
Total reclassifications, net of tax |  | $ | (326) |  |  | $ | (416) |  |  | $ | (656) |  |  | $ | (555) |  |  |
Accumulated other comprehensive loss | Accumulated other comprehensive loss – Changes in the components of accumulated other comprehensive loss during the six months ended June 30, 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 |  | — |  |  | (189) |  |  | 799 |  |  | 2,338 |  |  | 2,948 |
Amounts reclassified from accumulated other comprehensive loss |  | 166 |  |  | — |  |  | 490 |  |  | — |  |  | 656 |
Net current-period other comprehensive income (loss) |  | 166 |  |  | (189) |  |  | 1,289 |  |  | 2,338 |  |  | 3,604 |
Balance, June 30, 2021 |  | $ | (21,790) |  |  | $ | (279) |  |  | $ | (4,062) |  |  | $ | (11,698) |  |  | $ | (37,829) |
(1) Other comprehensive loss before reclassifications is net of an income tax benefit of $66. (2) Other comprehensive income before reclassifications is net of income tax expense of $283.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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