Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Dec. 31, 2014
Other Intangible Assets
Gross Carrying Amount	$ 74,393		$ 74,393		$ 74,393
Accumulated Amortization	(40,448)		(40,448)		(38,491)
Total amortization expense	33,945		33,945		35,902
Amortization expense	984	$ 1,045	1,957	$ 2,079
Customer lists/relationships
Other Intangible Assets
Gross Carrying Amount	51,804		51,804		51,804
Accumulated Amortization	(25,752)		(25,752)		(24,415)
Total amortization expense	26,052		26,052		27,389
Patents
Other Intangible Assets
Gross Carrying Amount	10,319		10,319		10,319
Accumulated Amortization	(10,319)		(10,319)		(10,319)
Other intangibles
Other Intangible Assets
Gross Carrying Amount	12,270		12,270		12,270
Accumulated Amortization	(4,377)		(4,377)		(3,757)
Total amortization expense	$ 7,893		$ 7,893		$ 8,513