Discontinued Operations Summarized results of discontinued operations (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Net sales		$ 29,680
Discontinued Operation, Cost of Materials		21,027
Discontinued Operation, Operating costs and expenses		7,288
Discontinued Operation, Interest expense	[1]	333
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax		1,032
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period	[2]	(3,908)
Gain (loss) on sale of discontinued operations, net of income taxes		2,994	$ 1,306
Income (Loss) from Discontinued Operations, Net of Income Taxes		7,934
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 benefit for the three months ended March 31, 2016 includes $4,207 reversal of valuation allowance resulting from the sale of TPI.