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Comprehensive Income - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2023		Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Amortization of defined benefit pension items
Prior service cost	[1]	$ 5		$ 1	$ 10	$ 3
Actuarial losses	[1]	109		229	238	435
Total before tax		114		230	248	438
Tax benefit		(30)	[1]	(60)	(65)	(114)
Net of tax		$ 84		$ 170	$ 183	$ 324
[1] These amounts were included in pension expense. See Note 7 for additional details.

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