Discontinued Operations (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended		12 Months Ended	15 Months Ended
	Nov. 08, 2017	Jan. 19, 2016	Sep. 30, 2017	Oct. 01, 2016	Jan. 02, 2016	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of discontinued operations before income taxes			$ 0	$ 1,176		$ 0	$ (97)
Assets of discontinued operations			66,618			66,618		$ 75,013	$ 75,013
Net sales of discontinued operations			26,543	29,380		82,099	106,421
Net income (loss) of discontinued operations			(8,607)	1,372		(9,671)	3,043
Office Products Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill and other intangible assets			7,000
Packaging Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill and other intangible assets					$ 9,900
Proceeds from sale of discontinued operations		$ 89,600
Sale of discontinued operations, transaction costs		$ 6,300
Gain (loss) on sale of discontinued operations before income taxes				1,200	$ (5,000)		(100)	1,400	(3,600)
Assets of discontinued operations			0			0		0	0
Liabilities of discontinued operations			$ 0			$ 0		$ 0	$ 0
Net sales of discontinued operations				0			6,600
Net income (loss) of discontinued operations				$ 700			$ (4,400)
Subsequent Event [Member] | Office Products Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued operations	$ 37,800