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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Percentage of sales	100.00%	100.00%	100.00%	100.00%
Sales	$ 368,653	$ 366,660	$ 1,128,350	$ 1,104,805
United States [Member]
Disaggregation of Revenue [Line Items]
Sales	306,050	289,480	946,195	889,515
International [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 62,603	$ 77,180	$ 182,155	$ 215,290
Nylon [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	28.00%	28.00%	28.00%	29.00%
Caprolactam [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	18.00%	19.00%	18.00%	19.00%
Ammonium Sulfate Fertilizers [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	19.00%	20.00%	20.00%	20.00%
Chemical Intermediates [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	35.00%	33.00%	34.00%	32.00%

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- Definition

Percentage Of Total Sales

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- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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