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FAIR VALUE MEASUREMENTS: (Tables) | 12 Months Ended
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Dec. 31, 2012
FAIR VALUE MEASUREMENTS: |
Schedule of financial assets and liabilities measured at fair value |
|  | Estimated Fair Value December 31, 2012 |
|  | Total |  | Input Levels Used |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and equivalents |  | $ | 63,862 |  | $ | 63,862 |  | $ | — |  | $ | — |
Auction rate security |  | 9,485 |  | — |  | — |  | 9,485 |
Available for sale securities, excluding the auction rate security |  | 84,568 |  | — |  | 84,568 |  | — |
Commodity futures contracts, net |  | (112 | ) | (112 | ) | — |  | — |
Trading securities |  | 49,378 |  | 49,378 |  | — |  | — |
Total assets measured at fair value |  | $ | 207,181 |  | $ | 113,128 |  | $ | 84,568 |  | $ | 9,485 |
|  | Estimated Fair Value December 31, 2011 |
|  | Total |  | Input Levels Used |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and equivalents |  | $ | 78,612 |  | $ | 78,612 |  | $ | — |  | $ | — |
Auction rate security |  | 7,453 |  | — |  | — |  | 7,453 |
Available for sale securities, excluding the auction rate security |  | 57,835 |  | — |  | 57,835 |  | — |
Foreign currency forward contracts |  | 205 |  | — |  | 205 |  | — |
Commodity futures contracts |  | 203 |  | 203 |  | — |  | — |
Commodity options contracts |  | — |  | — |  | — |  | — |
Trading securities |  | 41,768 |  | 41,768 |  | — |  | — |
Total assets measured at fair value |  | $ | 186,076 |  | $ | 120,583 |  | $ | 58,040 |  | $ | 7,453 |
Summary of the aggregate fair value, gross unrealized gains, gross unrealized losses, realized losses and amortized cost basis of investment portfolio by major security type |
|  | December 31, 2012 |
|  | Amortized |  | Fair |  | Unrealized |  | Realized |
Available for Sale: |  | Cost |  | Value |  | Gains |  | Losses |  | Losses |
Auction rate security |  | $ | 8,410 |  | $ | 9,485 |  | $ | 1,075 |  | $ | — |  | $ | — |
Municipal bonds |  | 84,199 |  | 84,551 |  | 352 |  | — |  | — |
Mutual funds |  | 20 |  | 17 |  | — |  | (3 | ) | — |
|  | $ | 92,629 |  | $ | 94,053 |  | $ | 1,427 |  | $ | (3 | ) | $ | — |
|  | December 31, 2011 |
|  | Amortized |  | Fair |  | Unrealized |  | Realized |
Available for Sale: |  | Cost |  | Value |  | Gains |  | Losses |  | Losses |
Auction rate security |  | $ | 8,410 |  | $ | 7,453 |  | $ | — |  | $ | (957 | ) | $ | — |
Municipal bonds |  | 57,389 |  | 57,791 |  | 402 |  | — |  | — |
Mutual funds |  | 45 |  | 44 |  | — |  | (1 | ) | — |
|  | $ | 65,844 |  | $ | 65,288 |  | $ | 402 |  | $ | (958 | ) | $ | — |
Schedule of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) |
|  | 2012 |  | 2011 |
Balance at January 1 |  | $ | 7,453 |  | $ | 6,775 |
Unrealized gain recognized in accumulated other comprehensive loss |  | 2,032 |  | 678 |
Balance at December 31 |  | $ | 9,485 |  | $ | 7,453 |
Schedule of assets measured at fair value on a nonrecurring basis |
|  | December 31, 2012 |
|  | Fair Value |  | Level Used to Determine Fair Value |
|  | Basis |  | Level 1 |  | Level 2 |  | Level 3 |
Equity method investment |  | $ | 2,127 |  | $ | — |  | $ | — |  | $ | 2,127 |
|  | December 31, 2011 |
|  | Fair Value |  | Level Used to Determine Fair Value |
|  | Basis |  | Level 1 |  | Level 2 |  | Level 3 |
Equity method investment |  | $ | 3,935 |  | $ | — |  | $ | — |  | $ | 3,935 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, 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 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 3: 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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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant 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 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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