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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, 2022		Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Amortization of defined benefit pension items
Prior service cost	[1]	$ 1		$ (15)	$ 3	$ (31)
Actuarial losses	[1]	229		262	435	525
Total before tax		230		247	438	494
Tax benefit		(60)	[1]	(65)	(114)	(129)
Net of tax		$ 170		$ 182	$ 324	$ 365
[1] These amounts were included in pension expense. See Note 8 for additional details.

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