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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 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 + Details
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