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Comprehensive Income (Loss) - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amortization of defined benefit pension items
Prior service cost			$ (47)
Actuarial losses			620
Total before tax			573
Tax benefit			(149)
Net of tax	$ 142	$ 116	$ 424	$ 347

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