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FAIR VALUE MEASUREMENTS: (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Fair value on a recurring basis |  |
Industrial revenue development bonds, carrying amount, approximates fair value | $ 7,500 | $ 7,500
Cost Basis |  |
Fair value on a recurring basis |  |
Industrial revenue development bonds, carrying amount, approximates fair value | 7,500 | 7,500
Estimated Fair Value |  |
Fair value on a recurring basis |  |
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 | 7,453 | 6,775
Unrealized gain recognized in accumulated other comprehensive loss | 2,032 | 678
Balance at the end of the period | $ 9,485 | $ 7,453

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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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