Discontinued Operations Summarized results of discontinued operations (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014	Mar. 15, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets of discontinued operations, accounts receivable				$ 16,688
Disposal Group, Including Discontinued Operation, Consideration						$ 55,070
Disposal Group, Including Discontinued Operation, Contingent Consideration						$ 1,500
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		$ 2,003
Disposal Group, Including Discontinued Operation, Inventory, Current				19,353
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current				1,099
Disposal Group, Including Discontinued Operation, Assets, Current		0		37,140
Discontinued Operation, Net sales		29,680		132,821	$ 138,165
Discontinued Operation, Cost of Materials		21,027		93,405	97,981
Discontinued Operation, Operating costs and expenses		7,288		32,994	33,830
Discontinued Operation, Interest expense	[1]	333		1,457	712
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax		1,032		4,965	5,642
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period		(3,770)	[2]	1,949	2,312
Gain (loss) on sale of discontinued operations, net of income taxes		1,306		0	0
Income (Loss) from Discontinued Operations, Net of Income Taxes		6,108		$ 3,016	$ 3,330
Total Plastics Inc [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Valuation Allowances and Reserves, Additions for Adjustments		$ 4,207

[1] Interest expense was allocated to the discontinued operation based on the debt that was required to be paid as a result of the sale of TPI.

[2] Income tax expense for the year ended December 31, 2016 includes $4,207 reversal of valuation allowance resulting from the sale of TPI.