Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (9,570)	$ 15,380	$ 15,140
Other comprehensive income (loss), net of taxes:
Foreign currency translation	401	(3,257)	5,593
Net change in market value of interest rate swap	(104)
Net change in market value of investments		141	(32)
Other comprehensive income (loss)	297	(3,116)	5,561
Comprehensive income (loss)	$ (9,273)	$ 12,264	$ 20,701