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Comprehensive Income (Loss) - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Amortization of defined benefit pension items
Prior service cost	$ (62)	$ (63)
Actuarial losses	1,074	826
Total before tax	1,012	763
Tax benefit	(264)	(198)
Net of tax	$ 748	$ 565

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