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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 27,556	$ 33,760	$ 66,267	$ 73,111
Other comprehensive (loss) income:
Foreign currency translation adjustment	(1,057)	2,200	2,902	(883)
Minimum post retirement benefit plan adjustments	27	18	81	54
Other comprehensive (loss) income	(1,030)	2,218	2,983	(829)
Total comprehensive income	$ 26,526	$ 35,978	$ 69,250	$ 72,282

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