Discontinued Operation - Summarized Results of Discontinued Operation (Details) - Total Plastics Inc - Discontinued Operations, Disposed of by Sale - USD ($) $ in Thousands		3 Months Ended	9 Months Ended		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2016		Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		$ 0	$ 29,680
Cost of materials		0	21,027
Operating costs and expenses		0	7,288
Interest expense	[1]	0	333
Income from discontinued operations before income taxes		0	1,032
Income tax expense benefit		0	(3,908)	[2]
(Loss) gain on sale of discontinued operations, net of income taxes		(1,688)	1,306		$ 1,306
Income from discontinued operations, net of income taxes		$ (1,688)	6,246
Reversal of valuation allowance			$ 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 nine months ended September 30, 2016 includes $4,207 reversal of valuation allowance resulting from the sale of TPI.