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Derivatives and Fair Value of Financial Instruments (Details) (USD $) | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Commodities |  |
Assets: |  |
Derivatives | $ 2,398,000 | $ 5,144,000
Margin account | 6,188,000 | 8,619,000
Derivative assets and liabilities, net basis | 5,226,000 | 8,234,000
Liabilities: |  |
Derivatives | 3,360,000 | 5,529,000
Interest rate swaps |  |
Liabilities: |  |
Derivatives | 9,900,000 | 11,268,000
Foreign currencies |  |
Assets: |  |
Derivatives | 88,000 | 2,247,000
Liabilities: |  |
Derivatives | 500,000 | 3,380,000
Money market funds |  |
Assets: |  |
Available-for-sale securities | 69,867,000 | 139,420,000
Corporate bonds |  |
Assets: |  |
Available-for-sale securities | 133,989,000 | 89,146,000
U.S. Government agency securities |  |
Assets: |  |
Available-for-sale securities | 18,603,000 | 9,757,000
U.S. Treasury securities |  |
Assets: |  |
Available-for-sale securities | 36,095,000 | 4,905,000
Collateralized mortgage obligations |  |
Assets: |  |
Available-for-sale securities | 22,720,000 | 15,011,000
Fixed rate municipal notes and bonds |  |
Assets: |  |
Available-for-sale securities | 21,335,000 | 17,788,000
Asset backed debt securities |  |
Assets: |  |
Available-for-sale securities | 10,536,000 | 3,533,000
Emerging markets debt mutual fund |  |
Assets: |  |
Available-for-sale securities | 17,687,000 | 16,399,000
High yield trading debt securities |  |
Assets: |  |
Trading securities | 22,349,000 | 20,750,000
Emerging markets trading debt mutual fund |  |
Assets: |  |
Trading securities | 2,686,000 | 2,487,000
Emerging markets trading debt securities |  |
Assets: |  |
Trading securities | 2,246,000 | 2,355,000
Recurring basis | Balance at period end |  |
Assets: |  |
Total Assets | 398,711,000 | 364,571,000
Liabilities: |  |
Total Liabilities | 13,760,000 | 20,177,000
Recurring basis | Balance at period end | Commodities |  |
Assets: |  |
Derivatives | 2,398,000 | 5,144,000
Margin account | 6,188,000 | 8,619,000
Derivative assets and liabilities, net basis | 5,226,000 | 8,234,000
Liabilities: |  |
Derivatives | 3,360,000 | 5,529,000
Recurring basis | Balance at period end | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 9,900,000 | 11,268,000
Recurring basis | Balance at period end | Foreign currencies |  |
Assets: |  |
Derivatives | 88,000 | 2,247,000
Liabilities: |  |
Derivatives | 500,000 | 3,380,000
Recurring basis | Balance at period end | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 69,867,000 | 139,420,000
Recurring basis | Balance at period end | Money market funds | Other current assets |  |
Assets: |  |
Trading securities | 3,674,000 | 4,521,000
Recurring basis | Balance at period end | Corporate bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 133,989,000 | 89,146,000
Recurring basis | Balance at period end | Corporate bonds | Other current assets |  |
Assets: |  |
Trading securities | 64,000 | 72,000
Recurring basis | Balance at period end | U.S. Government agency securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 18,603,000 | 9,757,000
Recurring basis | Balance at period end | U.S. Government agency securities | Other current assets |  |
Assets: |  |
Trading securities | 2,405,000 | 2,085,000
Recurring basis | Balance at period end | U.S. Treasury securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 36,095,000 | 4,905,000
Recurring basis | Balance at period end | U.S. Treasury securities | Other current assets |  |
Assets: |  |
Trading securities | 1,409,000 | 1,474,000
Recurring basis | Balance at period end | Collateralized mortgage obligations | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 22,720,000 | 15,011,000
Recurring basis | Balance at period end | Fixed rate municipal notes and bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 21,335,000 | 17,788,000
Recurring basis | Balance at period end | Asset backed debt securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 10,536,000 | 3,533,000
Recurring basis | Balance at period end | Emerging markets debt mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 17,687,000 | 16,399,000
Recurring basis | Balance at period end | High yield trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 22,349,000 | 20,750,000
Recurring basis | Balance at period end | Other | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 1,483,000 | 1,484,000
Recurring basis | Balance at period end | Other | Other current assets |  |
Assets: |  |
Trading securities | 365,000 | 236,000
Recurring basis | Balance at period end | Other debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 238,000 | 221,000
Recurring basis | Balance at period end | Emerging markets trading debt mutual fund | Short-term investments |  |
Assets: |  |
Trading securities | 2,686,000 | 2,487,000
Recurring basis | Balance at period end | Emerging markets trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 2,246,000 | 2,355,000
Recurring basis | Balance at period end | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 16,614,000 | 13,563,000
Recurring basis | Balance at period end | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 6,946,000 | 7,490,000
Recurring basis | Balance at period end | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 4,914,000 | 4,483,000
Recurring basis | Level 1 |  |
Assets: |  |
Total Assets | 122,043,000 | 190,167,000
Liabilities: |  |
Total Liabilities | 3,360,000 | 5,529,000
Recurring basis | Level 1 | Commodities |  |
Assets: |  |
Derivatives | 2,398,000 | 5,144,000
Liabilities: |  |
Derivatives | 3,360,000 | 5,529,000
Recurring basis | Level 1 | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 69,687,000 | 139,420,000
Recurring basis | Level 1 | Money market funds | Other current assets |  |
Assets: |  |
Trading securities | 3,674,000 | 4,521,000
Recurring basis | Level 1 | Emerging markets debt mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 17,687,000 | 16,399,000
Recurring basis | Level 1 | Other | Other current assets |  |
Assets: |  |
Trading securities | 316,000 | 159,000
Recurring basis | Level 1 | Emerging markets trading debt mutual fund | Short-term investments |  |
Assets: |  |
Trading securities | 2,686,000 | 2,487,000
Recurring basis | Level 1 | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 16,614,000 | 13,563,000
Recurring basis | Level 1 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 3,887,000 | 3,991,000
Recurring basis | Level 1 | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 4,914,000 | 4,483,000
Recurring basis | Level 2 |  |
Assets: |  |
Total Assets | 276,668,000 | 174,404,000
Liabilities: |  |
Total Liabilities | 10,400,000 | 14,648,000
Recurring basis | Level 2 | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 9,900,000 | 11,268,000
Recurring basis | Level 2 | Foreign currencies |  |
Assets: |  |
Derivatives | 88,000 | 2,247,000
Liabilities: |  |
Derivatives | 500,000 | 3,380,000
Recurring basis | Level 2 | Corporate bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 133,989,000 | 89,146,000
Recurring basis | Level 2 | Corporate bonds | Other current assets |  |
Assets: |  |
Trading securities | 64,000 | 72,000
Recurring basis | Level 2 | U.S. Government agency securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 18,603,000 | 9,757,000
Recurring basis | Level 2 | U.S. Government agency securities | Other current assets |  |
Assets: |  |
Trading securities | 2,405,000 | 2,085,000
Recurring basis | Level 2 | U.S. Treasury securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 36,095,000 | 4,905,000
Recurring basis | Level 2 | U.S. Treasury securities | Other current assets |  |
Assets: |  |
Trading securities | 1,409,000 | 1,474,000
Recurring basis | Level 2 | Collateralized mortgage obligations | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 22,720,000 | 15,011,000
Recurring basis | Level 2 | Fixed rate municipal notes and bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 21,335,000 | 17,788,000
Recurring basis | Level 2 | Asset backed debt securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 10,536,000 | 3,533,000
Recurring basis | Level 2 | High yield trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 22,349,000 | 20,750,000
Recurring basis | Level 2 | Other | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 1,483,000 | 1,484,000
Recurring basis | Level 2 | Other | Other current assets |  |
Assets: |  |
Trading securities | 49,000 | 77,000
Recurring basis | Level 2 | Other debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 238,000 | 221,000
Recurring basis | Level 2 | Emerging markets trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 2,246,000 | 2,355,000
Recurring basis | Level 2 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | $ 3,059,000 | $ 3,499,000

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