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Accumulated other comprehensive loss (Tables)
 9 Months Ended
Sep. 30, 2020
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 PlansForeign Currency TranslationTotal
Quarters Ended:
Balance at June 30, 2020$(140,076)$(103)$(140,179)
Other comprehensive loss before reclassifications— (69)(69)
Amounts reclassified from AOCL1,161 — 1,161 
Total other comprehensive income1,161 (69)1,092 
Balance at Sept. 30, 2020$(138,915)$(172)$(139,087)
Balance at June 30, 2019$(134,233)$39 $(134,194)
Other comprehensive loss before reclassifications— (238)(238)
Amounts reclassified from AOCL1,073 — 1,073 
Total other comprehensive income1,073 (238)835 
Balance at Sept. 30, 2019$(133,160)$(199)$(133,359)
Retirement PlansForeign Currency TranslationTotal
Nine Months Ended:
Balance at Dec. 31, 2019$(142,398)$(199)$(142,597)
Other comprehensive income before reclassifications— 27 27 
Amounts reclassified from AOCL3,483 — 3,483 
Total other comprehensive income3,483 27 3,510 
Balance at Sept. 30, 2020$(138,915)$(172)$(139,087)
Balance at Dec. 31, 2018$(136,893)$382 $(136,511)
Other comprehensive income before reclassifications— (581)(581)
Amounts reclassified from AOCL3,733 — 3,733 
Total other comprehensive income3,733 (581)3,152 
Balance at Sept. 30, 2019$(133,160)$(199)$(133,359)
Reclassification out of Accumulated Other Comprehensive Income Amounts reclassified out of AOCL are summarized below (in thousands):
Quarter ended Sept. 30,Nine months ended Sept. 30,
2020201920202019
Amortization of prior service credit, net$(120)$(120)$(360)$(360)
Amortization of actuarial loss1,671 1,551 5,013 4,653 
Pension payment timing related charges— — — 686 
Total reclassifications, before tax1,551 1,431 4,653 4,979 
Income tax effect(390)(358)(1,170)(1,246)
Total reclassifications, net of tax$1,161 $1,073 $3,483 $3,733