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Major Customers and Suppliers (Details) - supplier | 12 Months Ended
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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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