Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net income (loss)	$ (600)	$ (1,300)	$ 9,000	$ (3,000)
Net pension adjustments, net of tax:
Reclassification of adjustment for defined benefit plans recorded in net loss		100	100	200
Total net pension adjustments		100	100	200
Net foreign currency translation:
Unrealized foreign currency translation gains (losses)		100		(200)
Total net foreign currency translation		100		(200)
Total other comprehensive income, net of tax		200	100
Comprehensive income (loss)	$ (600)	$ (1,100)	$ 9,100	$ (3,000)