CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 5,266	$ (16,437)	$ (5,122)	$ (201,953)
Other comprehensive income (loss):
Pension adjustment and reclassification adjustment, net of taxes	152	186	458	1,104
Foreign currency translation	(239)	(25)	(34)	(423)
Comprehensive income (loss)	$ 5,179	$ (16,276)	$ (4,698)	$ (201,272)