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Comprehensive Income - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Amortization of defined benefit pension items
Prior service cost	[1]	$ 5		$ 2	$ 15	$ 5
Actuarial losses	[1]	119		217	357	652
Total before tax		124		219	372	657
Tax benefit		(32)	[1]	(57)	(97)	(171)
Net of tax		$ 92		$ 162	$ 275	$ 486
[1] These amounts were included in pension expense. See Note 7 for additional details.

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