Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2018	Jun. 28, 2017	Jun. 27, 2018	Jun. 28, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 11,626	$ 8,749	$ 21,385	$ 17,122
Other comprehensive income, net of tax:
Minimum pension liability adjustment, net of tax of $7, $9, $13 and $18, respectively	21	14	43	28
Recognition of unrealized loss on hedge transactions, net of tax of $1,175, $(985), $90 and $(1,382), respectively	3,369	(1,544)	256	(2,167)
Other comprehensive income (loss)	3,390	(1,530)	299	(2,139)
Total comprehensive income	$ 15,016	$ 7,219	$ 21,684	$ 14,983