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Comprehensive Income (Loss) - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Amortization of defined benefit pension items
Prior service cost			$ (31)
Actuarial losses			525
Total before tax			494
Tax benefit			(129)
Net of tax	$ 182	$ 144	$ 365	$ 282

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