v3.3.1.900

Major Customers and Suppliers (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Major Customers and Suppliers
Insurance coverage limit	$ 200,000,000
Sales | Customer concentration | Nitrogen Fertilizer
Major Customers and Suppliers
Concentration risk (as a percent)	24.00%	27.00%	28.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer A
Major Customers and Suppliers
Concentration risk (as a percent)	10.00%	17.00%	15.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer B
Major Customers and Suppliers
Concentration risk (as a percent)	14.00%	10.00%	13.00%

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+ 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=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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