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Major Customers and Suppliers (Details) - supplier | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Sales | Customer concentration | Petroleum | Customer A |  |  |
Major Customers and Suppliers |  |  |
Concentration risk | 19.00% | 15.00% | 14.00%
Sales | Customer concentration | Nitrogen Fertilizer |  |  |
Major Customers and Suppliers |  |  |
Concentration risk | 16.00% | 20.00% | 24.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer B |  |  |
Major Customers and Suppliers |  |  |
Concentration risk | 5.00% | 10.00% | 10.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer C |  |  |
Major Customers and Suppliers |  |  |
Concentration risk | 11.00% | 10.00% | 14.00%
Contracted volume | Supplier concentration | Petroleum |  |  |
Major Customers and Suppliers |  |  |
Concentration risk | 55.00% | 61.00% | 61.00%
Number of major suppliers | 1 | 1 | 1

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