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FAIR VALUE MEASUREMENTS: (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Fair value measurements |  |
Trading securities | $ 41,768 | $ 38,504
Fair value measured on a recurring basis | Estimated Fair Value |  |
Fair value measurements |  |
Cash and cash equivalents | 78,612 | 115,976
Auction rate security | 7,453 | 6,775
Available-for-sale securities excluding the auction rate security | 57,835 | 27,178
Trading securities | 41,768 | 38,504
Total assets measured at fair value | 186,076 | 197,054
Fair value measured on a recurring basis | Estimated Fair Value | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | 205 | 942
Fair value measured on a recurring basis | Estimated Fair Value | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 203 | 2,310
Fair value measured on a recurring basis | Estimated Fair Value | Commodity option contracts |  |
Fair value measurements |  |
Derivative instruments, net |  | 5,369
Fair value measured on a recurring basis | Level 1 |  |
Fair value measurements |  |
Cash and cash equivalents | 78,612 | 115,976
Trading securities | 41,768 | 38,504
Total assets measured at fair value | 120,583 | 162,159
Fair value measured on a recurring basis | Level 1 | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 203 | 2,310
Fair value measured on a recurring basis | Level 1 | Commodity option contracts |  |
Fair value measurements |  |
Derivative instruments, net |  | 5,369
Fair value measured on a recurring basis | Level 2 |  |
Fair value measurements |  |
Available-for-sale securities excluding the auction rate security | 57,835 | 27,178
Total assets measured at fair value | 58,040 | 28,120
Fair value measured on a recurring basis | Level 2 | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | 205 | 942
Fair value measured on a recurring basis | Level 3 |  |
Fair value measurements |  |
Auction rate security | 7,453 | 6,775
Total assets measured at fair value | $ 7,453 | $ 6,775

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- Definition This element represents the aggregate of the assets, including derivative assets (liabilities), net, at period end measured at fair value by the entity. For derivative instruments, the fair values as of the balance sheet date are the assets less any liabilities of a derivative or group of derivatives. + References No definition available. + Details
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- Definition This item represents the fair value of securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process, classified as Available-for-sale Securities. + References No definition available. + Details
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- Definition This item represents the fair value of investments in debt and equity securities classified as Available-for-sale Securities, excluding auction rate securities. + References No definition available. + Details
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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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -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. + Details
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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 Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 (a) -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 Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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