CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,952	$ (12,150)	$ (7,230)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation adjustments	(200)	(261)	(304)
Pension benefit plan	(662)	(81)	(1,063)
Total comprehensive income (loss)	$ 3,090	$ (12,492)	$ (8,597)