Acquisition of the New Business - Pro Forma Information (Details) - Activated Carbon and Filter Aid Business (New Business) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pro forma results of operations
Net sales	$ 152,998	$ 158,640	$ 295,701	$ 304,882
Net income	$ 5,864	$ 11,811	$ 8,326	$ 15,340
Net income per common share
Basic (in dollars per share)	$ 0.12	$ 0.24	$ 0.17	$ 0.31
Diluted (in dollars per share)	$ 0.12	$ 0.23	$ 0.16	$ 0.30

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- References

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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