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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 359,238	$ 376,704
United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	297,648	300,049
International [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 61,590	$ 76,655
Nylon [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	28.00%	29.00%
Caprolactam [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	18.00%	21.00%
Ammonium Sulfate Fertilizers [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	19.00%	18.00%
Chemical Intermediates [Member]
Disaggregation of Revenue [Line Items]
Percentage of sales	35.00%	32.00%

X

- Definition

Percentage Of Total Sales

+ References

No definition available.

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- Definition

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+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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=82913847&loc=SL49130539-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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