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FAIR VALUE MEASUREMENTS: (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value measurements |  |
Available for sale securities | $ 118,647 | $ 94,053
Trading securities | 63,215 | 49,378
Fair value measured on a recurring basis | Estimated Fair Value |  |
Fair value measurements |  |
Cash and equivalents | 88,283 | 63,862
Available for sale securities | 118,647 |
Auction rate security |  | 9,485
Available for sale securities, excluding the auction rate security |  | 84,568
Trading securities | 63,215 | 49,378
Total assets measured at fair value | 269,331 | 207,181
Fair value measured on a recurring basis | Estimated Fair Value | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | (684) |
Fair value measured on a recurring basis | Estimated Fair Value | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | (130) | (112)
Fair value measured on a recurring basis | Level 1 |  |
Fair value measurements |  |
Cash and equivalents | 88,283 | 63,862
Trading securities | 63,215 | 49,378
Total assets measured at fair value | 151,368 | 113,128
Fair value measured on a recurring basis | Level 1 | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | (130) | (112)
Fair value measured on a recurring basis | Level 2 |  |
Fair value measurements |  |
Available for sale securities | 118,647 |
Available for sale securities, excluding the auction rate security |  | 84,568
Total assets measured at fair value | 117,963 | 84,568
Fair value measured on a recurring basis | Level 2 | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | (684) |
Fair value measured on a recurring basis | Level 3 |  |
Fair value measurements |  |
Auction rate security |  | 9,485
Total assets measured at fair value |  | $ 9,485

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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 Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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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