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Major Customers and Suppliers (Details) - supplier	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Sales | Customer concentration | Petroleum | Customer A
Major Customers and Suppliers
Concentration risk (as a percent)	15.00%	14.00%	13.00%
Sales | Customer concentration | Nitrogen Fertilizer
Major Customers and Suppliers
Concentration risk (as a percent)	20.00%	24.00%	27.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer B
Major Customers and Suppliers
Concentration risk (as a percent)	10.00%	10.00%	17.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer C
Major Customers and Suppliers
Concentration risk (as a percent)	10.00%	14.00%	10.00%
Contracted volume | Supplier concentration | Petroleum
Major Customers and Suppliers
Concentration risk (as a percent)	61.00%	61.00%	67.00%
Number of major suppliers	1	1	1

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Represents the number of major suppliers.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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