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Accumulated other comprehensive loss (Tables)
 9 Months Ended
Sep. 30, 2022
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The following table summarizes the components of, and the changes in, Accumulated Other Comprehensive Loss (AOCL), net of tax (in thousands):
Retirement PlansForeign Currency TranslationAvailable-For-Sale InvestmentTotal
Quarters ended:
Balance at June 30, 2022$(111,560)$532 $— $(111,028)
Amounts reclassified from AOCL766 — — 766 
Total other comprehensive income766 — — 766 
Balance at Sept. 30, 2022$(110,794)$532 $— $(110,262)
Balance at June 30, 2021$(119,065)$461 $— $(118,604)
Other comprehensive loss before reclassifications— (39)40,293 40,254 
Amounts reclassified from AOCL1,657 — — 1,657 
Total other comprehensive income1,657 (39)40,293 41,911 
Balance at Sept. 30, 2021$(117,408)$422 $40,293 $(76,693)
Retirement PlansForeign Currency TranslationAvailable-For-Sale InvestmentTotal
Nine months ended:
Balance at Dec. 31, 2021$(113,090)$455 $15,419 $(97,216)
Other comprehensive income before reclassifications— 77 — 77 
Amounts reclassified from AOCL2,296 — (15,419)(13,123)
Total other comprehensive income (loss)2,296 77 (15,419)(13,046)
Balance at Sept. 30, 2022$(110,794)$532 $— $(110,262)
Balance at Dec. 31, 2020$(120,979)$(97)$— $(121,076)
Other comprehensive income before reclassifications— 519 40,293 40,812 
Amounts reclassified from AOCL3,571 — — 3,571 
Total other comprehensive income3,571 519 40,293 44,383 
Balance at Sept. 30, 2021$(117,408)$422 $40,293 $(76,693)
Schedule of Reclassification out of Accumulated Other Comprehensive Loss Amounts reclassified out of AOCL are summarized below (in thousands):
Quarter ended Sept. 30,Nine months ended Sept. 30,
2022202120222021
Amortization of prior service credit, net$(106)$(120)$(354)$(361)
Amortization of actuarial loss1,137 1,410 3,446 4,230 
Pension payment timing related charge— 946 — 946 
Realized gain on available-for-sale investment— — (20,800)— 
Total reclassifications, before tax1,031 2,236 (17,708)4,815 
Income tax effect(265)(579)4,585 (1,244)
Total reclassifications, net of tax$766 $1,657 $(13,123)$3,571