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Accumulated other comprehensive loss (Tables)
 6 Months Ended
Jun. 30, 2023
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 Mar. 31, 2023$(124,987)$532 $— $(124,455)
Amounts reclassified from AOCL988 — — 988 
Total other comprehensive income988 — — 988 
Balance at June 30, 2023$(123,999)$532 $— $(123,467)
Balance at Mar. 31, 2022$(112,366)$532 $— $(111,834)
Amounts reclassified from AOCL806 — — 806 
Total other comprehensive income806 — — 806 
Balance at June 30, 2022$(111,560)$532 $— $(111,028)
Retirement PlansForeign Currency TranslationAvailable-For-Sale InvestmentTotal
Six Months Ended:
Balance at Dec. 31, 2022$(126,065)$532 $— $(125,533)
Other comprehensive income before reclassifications2,066 — — 2,066 
Total other comprehensive income (loss)2,066 — — 2,066 
Balance at June 30, 2023$(123,999)$532 $— $(123,467)
Balance at Dec. 31, 2021$(113,090)$455 $15,419 $(97,216)
Other comprehensive income before reclassifications— 77 — 77 
Amounts reclassified from AOCL1,530 — (15,419)(13,889)
Total other comprehensive income1,530 77 (15,419)(13,812)
Balance at June 30, 2022$(111,560)$532 $— $(111,028)
Schedule of Reclassification out of Accumulated Other Comprehensive Loss Amounts reclassified out of AOCL are summarized below (in thousands):
Quarter ended June 30,Six months ended June 30,
2023202220232022
Amortization of prior service credit, net$(107)$(123)$(232)$(248)
Amortization of actuarial loss1,434 1,208 3,009 2,309 
Realized gain on available-for-sale investment— — — (20,800)
Total reclassifications, before tax1,327 1,085 2,777 (18,739)
Income tax effect(339)(279)(711)4,850 
Total reclassifications, net of tax$988 $806 $2,066 $(13,889)