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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net income (loss)	$ (30,584)	$ (5,455)	$ 7,864
Other comprehensive loss
Cumulative translation adjustment, net of tax	(2,997)	4,534	1,543
Pension adjustment, net of tax	2,056	(1,459)	(1,551)
Unrealized gains on available-for-sale securities	(21)
Comprehensive income (loss)	$ (31,546)	$ (2,380)	$ 7,856

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