Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Net income (loss)	$ (11,092)	$ (2,404)	$ 200	$ 6,459
Components of other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	648	(212)	1,187	703
Total components of other comprehensive income (loss), net of tax			1,187
Comprehensive income (loss)	$ (10,444)	$ (2,616)	1,387	$ 7,162
Retained Earnings [Member]
Net income (loss)			$ 200