Derivative Financial Instruments (Details)
item in Thousands, $ in Millions |
Dec. 31, 2016
USD ($)
item
|
| Exchange-Traded Derivatives | Long [Member] |
|
| Volume of activity related to derivative financial instruments |
|
| Nonmonetary units |
89,329
|
| Exchange-Traded Derivatives | Short [Member] |
|
| Volume of activity related to derivative financial instruments |
|
| Nonmonetary units |
95,633
|
| OTC Derivatives (Petroleum/Ethanol) | Long [Member] |
|
| Volume of activity related to derivative financial instruments |
|
| Nonmonetary units |
5,648
|
| OTC Derivatives (Petroleum/Ethanol) | Short [Member] |
|
| Volume of activity related to derivative financial instruments |
|
| Nonmonetary units |
5,967
|
| OTC Derivatives (Natural Gas) | Long [Member] |
|
| Volume of activity related to derivative financial instruments |
|
| Nonmonetary units |
10,834
|
| OTC Derivatives (Natural Gas) | Short [Member] |
|
| Volume of activity related to derivative financial instruments |
|
| Nonmonetary units |
10,435
|
| Interest Rate Swaps |
|
| Volume of activity related to derivative financial instruments |
|
| Monetary units | $ |
$ 100.0
|