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Derivatives and Fair Value of Financial Instruments (Details 2) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Commodities |  |
Assets: |  |
Derivatives | $ 6,916,000 | $ 5,144,000
Margin account | 14,063,000 | 8,619,000
Derivative assets and liabilities, net basis | 13,867,000 | 8,234,000
Liabilities: |  |
Derivatives | 7,112,000 | 5,529,000
Interest rate swaps |  |
Liabilities: |  |
Derivatives | 9,810,000 | 11,268,000
Foreign currencies |  |
Assets: |  |
Derivatives |  | 2,247,000
Liabilities: |  |
Derivatives | 4,157,000 | 3,380,000
Money market funds |  |
Assets: |  |
Available-for-sale securities | 126,537,000 | 139,420,000
Corporate bonds |  |
Assets: |  |
Available-for-sale securities | 69,214,000 | 89,146,000
U.S. Government agency securities |  |
Assets: |  |
Available-for-sale securities | 23,775,000 | 9,757,000
Emerging markets debt mutual fund |  |
Assets: |  |
Available-for-sale securities | 18,734,000 | 16,399,000
U.S. Treasury securities |  |
Assets: |  |
Available-for-sale securities | 17,169,000 | 4,905,000
Collateralized mortgage obligations |  |
Assets: |  |
Available-for-sale securities | 15,162,000 | 15,011,000
Asset backed debt securities |  |
Assets: |  |
Available-for-sale securities | 12,238,000 | 3,533,000
Fixed rate municipal notes and bonds |  |
Assets: |  |
Available-for-sale securities |  | 17,788,000
High yield trading debt securities |  |
Assets: |  |
Trading securities | 23,406,000 | 20,750,000
Emerging markets trading debt mutual fund |  |
Assets: |  |
Trading securities | 3,237,000 | 2,487,000
Emerging markets trading debt securities |  |
Assets: |  |
Trading securities | 2,600,000 | 2,355,000
Recurring basis | Balance at period end |  |
Assets: |  |
Total Assets | 357,283,000 | 364,571,000
Liabilities: |  |
Total Liabilities | 21,079,000 | 20,177,000
Recurring basis | Balance at period end | Commodities |  |
Assets: |  |
Derivatives | 6,916,000 | 5,144,000
Margin account | 14,063,000 | 8,619,000
Derivative assets and liabilities, net basis | 13,867,000 | 8,234,000
Liabilities: |  |
Derivatives | 7,112,000 | 5,529,000
Recurring basis | Balance at period end | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 9,810,000 | 11,268,000
Recurring basis | Balance at period end | Foreign currencies |  |
Assets: |  |
Derivatives |  | 2,247,000
Liabilities: |  |
Derivatives | 4,157,000 | 3,380,000
Recurring basis | Balance at period end | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 126,537,000 | 139,420,000
Recurring basis | Balance at period end | Money market funds | Other current assets |  |
Assets: |  |
Trading securities | 3,157,000 | 4,521,000
Recurring basis | Balance at period end | Corporate bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 69,214,000 | 89,146,000
Recurring basis | Balance at period end | Corporate bonds | Other current assets |  |
Assets: |  |
Trading securities | 60,000 | 72,000
Recurring basis | Balance at period end | U.S. Government agency securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 23,775,000 | 9,757,000
Recurring basis | Balance at period end | U.S. Government agency securities | Other current assets |  |
Assets: |  |
Trading securities | 2,117,000 | 2,085,000
Recurring basis | Balance at period end | Emerging markets debt mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 18,734,000 | 16,399,000
Recurring basis | Balance at period end | U.S. Treasury securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 17,169,000 | 4,905,000
Recurring basis | Balance at period end | U.S. Treasury securities | Other current assets |  |
Assets: |  |
Trading securities | 1,567,000 | 1,474,000
Recurring basis | Balance at period end | Collateralized mortgage obligations | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 15,162,000 | 15,011,000
Recurring basis | Balance at period end | Asset backed debt securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 12,238,000 | 3,533,000
Recurring basis | Balance at period end | Fixed rate municipal notes and bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 17,788,000
Recurring basis | Balance at period end | Other | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 1,484,000
Recurring basis | Balance at period end | Other | Other current assets |  |
Assets: |  |
Trading securities | 239,000 | 236,000
Recurring basis | Balance at period end | High yield trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 23,406,000 | 20,750,000
Recurring basis | Balance at period end | Emerging markets trading debt mutual fund | Short-term investments |  |
Assets: |  |
Trading securities | 3,237,000 | 2,487,000
Recurring basis | Balance at period end | Emerging markets trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 2,600,000 | 2,355,000
Recurring basis | Balance at period end | Other debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 1,307,000 | 221,000
Recurring basis | Balance at period end | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 15,864,000 | 13,563,000
Recurring basis | Balance at period end | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 7,153,000 | 4,483,000
Recurring basis | Balance at period end | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 6,831,000 | 7,490,000
Recurring basis | Level 1 |  |
Assets: |  |
Total Assets | 186,608,000 | 190,167,000
Liabilities: |  |
Total Liabilities | 7,112,000 | 5,529,000
Recurring basis | Level 1 | Commodities |  |
Assets: |  |
Derivatives | 6,699,000 | 5,144,000
Liabilities: |  |
Derivatives | 7,112,000 | 5,529,000
Recurring basis | Level 1 | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 126,537,000 | 139,420,000
Recurring basis | Level 1 | Money market funds | Other current assets |  |
Assets: |  |
Trading securities | 3,157,000 | 4,521,000
Recurring basis | Level 1 | Emerging markets debt mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 18,734,000 | 16,399,000
Recurring basis | Level 1 | Other | Other current assets |  |
Assets: |  |
Trading securities | 187,000 | 159,000
Recurring basis | Level 1 | Emerging markets trading debt mutual fund | Short-term investments |  |
Assets: |  |
Trading securities | 3,237,000 | 2,487,000
Recurring basis | Level 1 | Other debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 822,000 |
Recurring basis | Level 1 | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 15,864,000 | 13,563,000
Recurring basis | Level 1 | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 7,153,000 | 4,483,000
Recurring basis | Level 1 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 4,218,000 | 3,991,000
Recurring basis | Level 2 |  |
Assets: |  |
Total Assets | 170,675,000 | 174,404,000
Liabilities: |  |
Total Liabilities | 13,967,000 | 14,648,000
Recurring basis | Level 2 | Commodities |  |
Assets: |  |
Derivatives | 217,000 |
Recurring basis | Level 2 | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 9,810,000 | 11,268,000
Recurring basis | Level 2 | Foreign currencies |  |
Assets: |  |
Derivatives |  | 2,247,000
Liabilities: |  |
Derivatives | 4,157,000 | 3,380,000
Recurring basis | Level 2 | Corporate bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 69,214,000 | 89,146,000
Recurring basis | Level 2 | Corporate bonds | Other current assets |  |
Assets: |  |
Trading securities | 60,000 | 72,000
Recurring basis | Level 2 | U.S. Government agency securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 23,775,000 | 9,757,000
Recurring basis | Level 2 | U.S. Government agency securities | Other current assets |  |
Assets: |  |
Trading securities | 2,117,000 | 2,085,000
Recurring basis | Level 2 | U.S. Treasury securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 17,169,000 | 4,905,000
Recurring basis | Level 2 | U.S. Treasury securities | Other current assets |  |
Assets: |  |
Trading securities | 1,567,000 | 1,474,000
Recurring basis | Level 2 | Collateralized mortgage obligations | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 15,162,000 | 15,011,000
Recurring basis | Level 2 | Asset backed debt securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 12,238,000 | 3,533,000
Recurring basis | Level 2 | Fixed rate municipal notes and bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 17,788,000
Recurring basis | Level 2 | Other | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 1,484,000
Recurring basis | Level 2 | Other | Other current assets |  |
Assets: |  |
Trading securities | 52,000 | 77,000
Recurring basis | Level 2 | High yield trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 23,406,000 | 20,750,000
Recurring basis | Level 2 | Emerging markets trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 2,600,000 | 2,355,000
Recurring basis | Level 2 | Other debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 485,000 | 221,000
Recurring basis | Level 2 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | $ 2,613,000 | $ 3,499,000

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