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FAIR VALUE MEASUREMENTS: (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Level 3 reconciliation |  |
Industrial revenue development bonds, carrying amount, approximates fair value | $ 7,500 | $ 7,500
Cost Basis |  |
Level 3 reconciliation |  |
Industrial revenue development bonds, carrying amount, approximates fair value | 7,500 | 7,500
Estimated Fair Value |  |
Level 3 reconciliation |  |
Industrial revenue development bonds, carrying amount, approximates fair value | 7,500 | 7,500
Auction rate security |  |
Level 3 reconciliation |  |
Balance at the beginning of the period | 6,775 | 7,710
Unrealized gain in other comprehensive loss | 678 | (935)
Balance at the end of the period | $ 7,453 | $ 6,775

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- Definition This element represents amount due for industrial development bonds carrying average floating interest rate. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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