Acquisitions (Pro Forma Financial Information of National Envelope) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Business Acquisition [Line Items]
Net sales	$ 480,576	$ 442,781	$ 1,450,105	$ 1,267,935
Income (loss) from continuing operations	(10,794)	13,427	(66,882)	(26,059)
Income (loss) per share from continuing operations - basic	$ (0.16)	$ 0.21	$ (1.00)	$ (0.40)
Income (loss) per share from continuing operations - diluted	$ (0.16)	$ 0.16	$ (1.00)	$ (0.40)
National Envelope Acquisition [Member]
Business Acquisition [Line Items]
Pro forma net sales		517,166		1,517,926
Pro forma loss from continuing operations		$ (7,981)		$ (71,239)
Pro forma loss per share from continuing operations - basic		$ (0.12)		$ (1.08)
Pro forma loss per share from continuing operations - diluted		$ (0.12)		$ (1.08)