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FAIR VALUE MEASUREMENTS: (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value Measurements |
Schedule of financial assets and liabilities measured at fair value |
|  | Estimated Fair Value December 31, 2014 |
|  | Total |  | Input Levels Used |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and equivalents |  | $ | 100,108 |  | $ | 100,108 |  | $ | — |  | $ | — |
Available for sale securities |  |  | 131,347 |  |  | 2,446 |  |  | 128,901 |  |  | — |
Foreign currency forward contracts |  |  | (1,939) |  |  | — |  |  | (1,939) |  |  | — |
Commodity futures contracts, net |  |  | (737) |  |  | (737) |  |  | — |  |  | — |
Trading securities |  |  | 71,682 |  |  | 71,682 |  |  | — |  |  | — |
Total assets measured at fair value |  | $ | 300,461 |  | $ | 173,499 |  | $ | 126,962 |  | $ | — |
|  | Estimated Fair Value December 31, 2013 |
|  | Total |  | Input Levels Used |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and equivalents |  | $ | 88,283 |  | $ | 88,283 |  | $ | — |  | $ | — |
Available for sale securities |  |  | 118,647 |  |  | — |  |  | 118,647 |  |  | — |
Foreign currency forward contracts |  |  | (684) |  |  | — |  |  | (684) |  |  | — |
Commodity futures contracts, net |  |  | (130) |  |  | (130) |  |  | — |  |  | — |
Trading securities |  |  | 63,215 |  |  | 63,215 |  |  | — |  |  | — |
Total assets measured at fair value |  | $ | 269,331 |  | $ | 151,368 |  | $ | 117,963 |  | $ | — |
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, 2014 |
|  | Amortized |  | Fair |  | Unrealized |  | Realized |
Available for Sale: |  | Cost |  | Value |  | Gains |  | Losses |  | Losses |
Municipal bonds |  | $ | 51,797 |  | $ | 51,804 |  | $ | 7 |  | $ | — |  | $ | — |
Corporate bonds |  |  | 72,587 |  |  | 72,075 |  |  | — |  |  | (512) |  |  | — |
Government securities |  |  | 2,450 |  |  | 2,446 |  |  |  |  |  | (4) |  |  |  |
Certificates of deposit |  |  | 5,014 |  |  | 5,007 |  |  |  |  |  | (7) |  |  |  |
Mutual funds |  |  | 20 |  |  | 15 |  |  | — |  |  | (5) |  |  | — |
|  | $ | 131,868 |  | $ | 131,347 |  | $ | 7 |  | $ | (528) |  | $ | — |
|  | December 31, 2013 |
|  | Amortized |  | Fair |  | Unrealized |  | Realized |
Available for Sale: |  | Cost |  | Value |  | Gains |  | Losses |  | Losses |
Municipal bonds |  | $ | 75,488 |  | $ | 75,622 |  | $ | 134 |  | $ | — |  | $ | — |
Corporate bonds |  |  | 37,258 |  |  | 37,214 |  |  | — |  |  | (44) |  |  | — |
Certificates of deposit |  |  | 5,796 |  |  | 5,794 |  |  |  |  |  | (2) |  |  |  |
Mutual funds |  |  | 20 |  |  | 17 |  |  | — |  |  | (3) |  |  | — |
|  | $ | 118,562 |  | $ | 118,647 |  | $ | 134 |  | $ | (49) |  | $ | — |

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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=36462937&loc=d3e19190-110258 + Details
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