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Sale of Bioplastics Manufacturing Business	6 Months Ended
Sale of Bioplastics Manufacturing Business	Jun. 30, 2013
Business Combinations [Abstract]
Sale of Bioplastics Manufacturing Business	Sale of Bioplastics Manufacturing Business. On February 8, 2013, the Company sold its bioplastics manufacturing business through a sale of substantially all of the assets included in its other segment, including all of the Company’s assets at its bioplastics manufacturing facility in Onaga, Kansas and certain assets of the Company’s extruder bio-resin laboratory located in Atchison, Kansas. These net assets had a net book value of $1,344. The sales price totaled $2,797 and resulted in a gain, net of $47 of taxes, of $1,406 that was recognized as a gain on sale of discontinued operations in the quarter ended March 31, 2013. The remaining income statement activity for the quarter and year to date periods ended June 30, 2013 and 2012 are not presented as discontinued operations due to their immateriality relative to the consolidated financial statements as a whole.