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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Percentage of sales	100.00%	100.00%	100.00%	100.00%
Sales	$ 345,215	$ 400,459	$ 660,110	$ 759,697
United States
Disaggregation of Revenue [Line Items]
Sales	289,551	342,497	547,193	640,145
International
Disaggregation of Revenue [Line Items]
Sales	$ 55,664	$ 57,962	$ 112,917	$ 119,552
Nylon
Disaggregation of Revenue [Line Items]
Percentage of sales	27.00%	27.00%	29.00%	28.00%
Caprolactam
Disaggregation of Revenue [Line Items]
Percentage of sales	20.00%	19.00%	20.00%	18.00%
Ammonium Sulfate Fertilizers
Disaggregation of Revenue [Line Items]
Percentage of sales	27.00%	21.00%	25.00%	20.00%
Chemical Intermediates
Disaggregation of Revenue [Line Items]
Percentage of sales	26.00%	33.00%	26.00%	34.00%

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- Definition

Percentage Of Total Sales

+ References

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- Definition

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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