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Accumulated other comprehensive loss (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table summarizes the components of, and the changes in, Accumulated Other Comprehensive Loss (AOCL), net of tax (in thousands):
| Retirement Plans |  | Foreign Currency Translation |  |  |  | Total
Quarters Ended: |  |  |  |  |  |  |
Balance at Mar. 31, 2021 | $ | (120,070) |  |  | $ | 272 |  |  |  |  | $ | (119,798) |
Other comprehensive income before reclassifications | — |  |  | 189 |  |  |  |  | 189 |
Amounts reclassified from AOCL | 1,005 |  |  | — |  |  |  |  | 1,005 |
Total other comprehensive income | 1,005 |  |  | 189 |  |  |  |  | 1,194 |
Balance at June 30, 2021 | $ | (119,065) |  |  | $ | 461 |  |  |  |  | $ | (118,604) |
Balance at Mar. 31, 2020 | $ | (141,277) |  |  | $ | 102 |  |  |  |  | $ | (141,175) |
Other comprehensive loss before reclassifications | — |  |  | (205) |  |  |  |  | (205) |
Amounts reclassified from AOCL | 1,201 |  |  | — |  |  |  |  | 1,201 |
Total other comprehensive income | 1,201 |  |  | (205) |  |  |  |  | 996 |
Balance at June 30, 2020 | $ | (140,076) |  |  | $ | (103) |  |  |  |  | $ | (140,179) |
| Retirement Plans |  | Foreign Currency Translation |  |  |  | Total
Six Months Ended: |  |  |  |  |  |  |
Balance at Dec. 31, 2020 | $ | (120,979) |  |  | $ | (97) |  |  |  |  | $ | (121,076) |
Other comprehensive income before reclassifications | — |  |  | 558 |  |  |  |  | 558 |
Amounts reclassified from AOCL | 1,914 |  |  | — |  |  |  |  | 1,914 |
Total other comprehensive income | 1,914 |  |  | 558 |  |  |  |  | 2,472 |
Balance at June 30, 2021 | $ | (119,065) |  |  | $ | 461 |  |  |  |  | $ | (118,604) |
Balance at Dec. 31, 2019 | $ | (142,398) |  |  | $ | (199) |  |  |  |  | $ | (142,597) |
Other comprehensive income before reclassifications | — |  |  | 96 |  |  |  |  | 96 |
Amounts reclassified from AOCL | 2,322 |  |  | — |  |  |  |  | 2,322 |
Total other comprehensive income | 2,322 |  |  | 96 |  |  |  |  | 2,418 |
Balance at June 30, 2020 | $ | (140,076) |  |  | $ | (103) |  |  |  |  | $ | (140,179) |
Schedule of Reclassification out of Accumulated Other Comprehensive Income | Amounts reclassified out of AOCL are summarized below (in thousands):
| Quarter ended June 30, |  | Six months ended June 30, |
| 2021 |  | 2020 |  | 2021 |  | 2020 |
Amortization of prior service credit, net | $ | (266) |  |  | $ | (131) |  |  | $ | (241) |  |  | $ | (240) |  |
Amortization of actuarial loss | 1,619 |  |  | 1,735 |  |  | 2,819 |  |  | 3,342 |  |
Total reclassifications, before tax | 1,353 |  |  | 1,604 |  |  | 2,578 |  |  | 3,102 |  |
Income tax effect | (348) |  |  | (403) |  |  | (664) |  |  | (780) |  |
Total reclassifications, net of tax | $ | 1,005 |  |  | $ | 1,201 |  |  | $ | 1,914 |  |  | $ | 2,322 |  |

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