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Derivatives and Fair Value of Financial Instruments (Details) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Assets: |  |
Available-for-sale securities | $ 0 | $ 308,380,000
Commodities |  |
Assets: |  |
Derivatives | 5,144,000 | 15,966,000
Margin account | 8,619,000 | 2,178,000
Derivative assets and liabilities, net basis | 8,234,000 | 8,974,000
Liabilities: |  |
Derivatives | 5,529,000 | 9,170,000
Interest rate swaps |  |
Assets: |  |
Derivatives |  | 1,410,000
Liabilities: |  |
Derivatives | 11,268,000 | 1,161,000
Foreign currencies |  |
Assets: |  |
Derivatives | 2,247,000 | 120,000
Liabilities: |  |
Derivatives | 3,380,000 | 11,652,000
Short-term investments |  |
Assets: |  |
Available-for-sale securities | 297,443,000 | 308,380,000
Trading securities | 25,813,000 | 23,825,000
Money market funds |  |
Assets: |  |
Available-for-sale securities | 139,420,000 | 110,164,000
Corporate bonds |  |
Assets: |  |
Available-for-sale securities | 89,146,000 | 82,351,000
Enhanced cash mutual fund |  |
Assets: |  |
Available-for-sale securities |  | 60,302,000
Fixed rate municipal notes and bonds |  |
Assets: |  |
Available-for-sale securities | 17,788,000 | 20,648,000
Emerging markets debt mutual fund |  |
Assets: |  |
Available-for-sale securities | 16,399,000 |
Collateralized mortgage obligations |  |
Assets: |  |
Available-for-sale securities | 15,011,000 | 12,380,000
U.S. Government agency securities |  |
Assets: |  |
Available-for-sale securities | 9,757,000 | 10,184,000
U.S. Treasury securities |  |
Assets: |  |
Available-for-sale securities | 4,905,000 | 7,148,000
Asset backed debt securities |  |
Assets: |  |
Available-for-sale securities | 3,533,000 | 2,848,000
Other |  |
Assets: |  |
Trading securities | 1,484,000 | 2,355,000
High yield trading debt securities |  |
Assets: |  |
Trading securities | 20,750,000 | 20,783,000
Emerging markets trading debt mutual funds |  |
Assets: |  |
Trading securities | 2,487,000 |
Emerging markets trading debt securities |  |
Assets: |  |
Trading securities | 2,355,000 | 2,072,000
Recurring basis | Balance at period end |  |
Assets: |  |
Total Assets | 364,571,000 | 382,442,000
Liabilities: |  |
Total Liabilities | 20,177,000 | 21,983,000
Recurring basis | Balance at period end | Commodities |  |
Assets: |  |
Derivatives | 5,144,000 | 15,966,000
Margin account | 8,619,000 | 2,178,000
Derivative assets and liabilities, net basis | 8,234,000 | 8,974,000
Liabilities: |  |
Derivatives | 5,529,000 | 9,170,000
Recurring basis | Balance at period end | Interest rate swaps |  |
Assets: |  |
Derivatives |  | 1,410,000
Liabilities: |  |
Derivatives | 11,268,000 | 1,161,000
Recurring basis | Balance at period end | Foreign currencies |  |
Assets: |  |
Derivatives | 2,247,000 | 120,000
Liabilities: |  |
Derivatives | 3,380,000 | 11,652,000
Recurring basis | Balance at period end | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 139,420,000 | 110,164,000
Recurring basis | Balance at period end | Money market funds | Other current assets |  |
Assets: |  |
Trading securities | 4,521,000 | 3,208,000
Recurring basis | Balance at period end | Corporate bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 89,146,000 | 82,351,000
Recurring basis | Balance at period end | Corporate bonds | Other current assets |  |
Assets: |  |
Trading securities | 72,000 |
Recurring basis | Balance at period end | Enhanced cash mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 60,302,000
Recurring basis | Balance at period end | Fixed rate municipal notes and bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 17,788,000 | 20,648,000
Recurring basis | Balance at period end | Emerging markets debt mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 16,399,000 |
Recurring basis | Balance at period end | Collateralized mortgage obligations | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 15,011,000 | 12,380,000
Recurring basis | Balance at period end | U.S. Government agency securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 9,757,000 | 10,184,000
Recurring basis | Balance at period end | U.S. Government agency securities | Other current assets |  |
Assets: |  |
Trading securities | 2,085,000 | 1,371,000
Recurring basis | Balance at period end | U.S. Treasury securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 4,905,000 | 7,148,000
Recurring basis | Balance at period end | U.S. Treasury securities | Other current assets |  |
Assets: |  |
Trading securities | 1,474,000 | 2,732,000
Recurring basis | Balance at period end | Asset backed debt securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 3,533,000 | 2,848,000
Recurring basis | Balance at period end | Other | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 1,484,000 | 2,355,000
Recurring basis | Balance at period end | Other | Other current assets |  |
Assets: |  |
Trading securities | 236,000 | 183,000
Recurring basis | Balance at period end | High yield trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 20,750,000 | 20,783,000
Recurring basis | Balance at period end | Emerging markets trading debt mutual funds | Short-term investments |  |
Assets: |  |
Trading securities | 2,487,000 |
Recurring basis | Balance at period end | Emerging markets trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 2,355,000 | 2,072,000
Recurring basis | Balance at period end | Other debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 221,000 | 970,000
Recurring basis | Balance at period end | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 13,563,000 | 13,332,000
Recurring basis | Balance at period end | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 7,490,000 | 8,157,000
Recurring basis | Balance at period end | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 4,483,000 | 3,758,000
Recurring basis | Level 1 |  |
Assets: |  |
Total Assets | 190,167,000 | 211,010,000
Liabilities: |  |
Total Liabilities | 5,529,000 | 9,170,000
Recurring basis | Level 1 | Commodities |  |
Assets: |  |
Derivatives | 5,144,000 | 15,958,000
Liabilities: |  |
Derivatives | 5,529,000 | 9,170,000
Recurring basis | Level 1 | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 139,420,000 | 110,164,000
Recurring basis | Level 1 | Money market funds | Other current assets |  |
Assets: |  |
Trading securities | 4,521,000 | 3,208,000
Recurring basis | Level 1 | Enhanced cash mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 60,302,000
Recurring basis | Level 1 | Emerging markets debt mutual fund | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 16,399,000 |
Recurring basis | Level 1 | Other | Other current assets |  |
Assets: |  |
Trading securities | 159,000 | 157,000
Recurring basis | Level 1 | Emerging markets trading debt mutual funds | Short-term investments |  |
Assets: |  |
Trading securities | 2,487,000 |
Recurring basis | Level 1 | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 13,563,000 | 13,332,000
Recurring basis | Level 1 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 3,991,000 | 4,131,000
Recurring basis | Level 1 | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 4,483,000 | 3,758,000
Recurring basis | Level 2 |  |
Assets: |  |
Total Assets | 174,404,000 | 171,432,000
Liabilities: |  |
Total Liabilities | 14,648,000 | 12,813,000
Recurring basis | Level 2 | Commodities |  |
Assets: |  |
Derivatives |  | 8,000
Recurring basis | Level 2 | Interest rate swaps |  |
Assets: |  |
Derivatives |  | 1,410,000
Liabilities: |  |
Derivatives | 11,268,000 | 1,161,000
Recurring basis | Level 2 | Foreign currencies |  |
Assets: |  |
Derivatives | 2,247,000 | 120,000
Liabilities: |  |
Derivatives | 3,380,000 | 11,652,000
Recurring basis | Level 2 | Corporate bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 89,146,000 | 82,351,000
Recurring basis | Level 2 | Corporate bonds | Other current assets |  |
Assets: |  |
Trading securities | 72,000 |
Recurring basis | Level 2 | Fixed rate municipal notes and bonds | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 17,788,000 | 20,648,000
Recurring basis | Level 2 | Collateralized mortgage obligations | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 15,011,000 | 12,380,000
Recurring basis | Level 2 | U.S. Government agency securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 9,757,000 | 10,184,000
Recurring basis | Level 2 | U.S. Government agency securities | Other current assets |  |
Assets: |  |
Trading securities | 2,085,000 | 1,371,000
Recurring basis | Level 2 | U.S. Treasury securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 4,905,000 | 7,148,000
Recurring basis | Level 2 | U.S. Treasury securities | Other current assets |  |
Assets: |  |
Trading securities | 1,474,000 | 2,732,000
Recurring basis | Level 2 | Asset backed debt securities | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 3,533,000 | 2,848,000
Recurring basis | Level 2 | Other | Short-term investments |  |
Assets: |  |
Available-for-sale securities | 1,484,000 | 2,355,000
Recurring basis | Level 2 | Other | Other current assets |  |
Assets: |  |
Trading securities | 77,000 | 26,000
Recurring basis | Level 2 | High yield trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 20,750,000 | 20,783,000
Recurring basis | Level 2 | Emerging markets trading debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 2,355,000 | 2,072,000
Recurring basis | Level 2 | Other debt securities | Short-term investments |  |
Assets: |  |
Trading securities | 221,000 | 970,000
Recurring basis | Level 2 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | $ 3,499,000 | $ 4,026,000

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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