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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income	$ 8,782	$ 7,261	$ 23,308	$ 18,381
Other comprehensive (loss) income, net of tax:
Cumulative translation adjustments	(1,427)	1,644	(1,849)	397
Pension and postretirement medical liability adjustments	726	1,242	3,089	4,833
Other comprehensive (loss) income	(701)	2,886	1,240	5,230
Comprehensive income	$ 8,081	$ 10,147	$ 24,548	$ 23,611

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