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Consolidated Statements of Comprehensive Income (Statement) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 5,844	$ 20,427	$ 74,589	$ 66,845
Other comprehensive (loss) income, net of taxes:
Foreign currency translation adjustments	(812)	3,357	(5,315)	5,763
Actuarial gain on retirement plan, net of tax effect of $(6), $(2), $(21) and $(8), respectively	5	5	31	15
Other comprehensive (loss) income, net of taxes	(807)	3,362	(5,284)	5,778
Comprehensive income	$ 5,037	$ 23,789	$ 69,305	$ 72,623

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