Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2016	Jul. 01, 2015	Jun. 29, 2016	Jul. 01, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (11,552)	$ 9,734	$ (1,598)	$ 18,267
Other comprehensive income, net of tax:
Minimum pension liability adjustment, net of tax of $2,152, $169, $2,160 and $338	21,825	264	21,838	528
Recognition of unrealized gain (loss) on hedge transactions, net of tax of $(2,057), $2,124, $(5,054) and $963	(3,221)	3,319	(7,914)	1,505
Other comprehensive income	18,604	3,583	13,924	2,033
Total comprehensive income	$ 7,052	$ 13,317	$ 12,326	$ 20,300