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Commitments And Contingencies (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($) property | Mar. 31, 2016 USD ($)
Trading Activity, Gains and Losses, Net [Line Items] |  |
Lease expenses | $ 10.3 | $ 9.4
Contracted future purchases | $ 461.3 |
Acquisition Of Fairmont, Minnesota and Wood River, Nebraska Ethanol Plants [Member] |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Number of ethanol plants | property | 2 |
Previously accrued contingent liabilities that no longer represent probable losses | $ 6.3 |
Gain contingency | $ 5.5 |

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