Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net income (loss)	$ (700)	$ 6,900	$ 8,300	$ 3,900
Net pension adjustments, net of tax:
Reclassification of adjustment for defined benefit plans recorded in net loss		100	100	300
Total net pension adjustments		100	100	300
Net foreign currency translation:
Unrealized foreign currency translation gains (losses)		900		700
Total net foreign currency translation		900		700
Total other comprehensive income, net of tax		1,000	100	1,000
Comprehensive income (loss)	$ (700)	$ 7,900	$ 8,400	$ 4,900