Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Net income (loss)	$ (8,965)	$ (5,930)	$ 3,256	$ 11,292
Components of other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	145	420	300	539
Total components of other comprehensive income (loss), net of tax			300
Comprehensive income (loss)	$ (8,820)	$ (5,510)	3,556	$ 11,831
Retained Earnings [Member]
Net income (loss)			$ 3,256