Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 25, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 14,341	$ (3,239)
Other comprehensive income:
Change in cumulative translation adjustment	98	97
Cash flow hedges:
Change in fair value of derivatives	13	(64)
Adjustment for net loss realized and included in net income	7	27
Total change in unrealized gain (loss) on derivative instruments	20	(37)
Other comprehensive income	118	60
Comprehensive income (loss)	$ 14,459	$ (3,179)