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FAIR VALUE MEASUREMENTS: (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair value measurements |  |
Available for sale securities | $ 134,501 | $ 131,347
Trading securities | 60,584 | 71,682
Fair value measured on a recurring basis |  |
Fair value measurements |  |
Cash and cash equivalents | 126,145 | 100,108
Available for sale securities | 134,501 | 131,347
Trading securities | 60,584 | 71,682
Total assets measured at fair value | 318,875 | 300,461
Fair value measured on a recurring basis | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | (2,626) | (1,939)
Fair value measured on a recurring basis | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 271 | (737)
Fair value measured on a recurring basis | Level 1 |  |
Fair value measurements |  |
Cash and cash equivalents | 126,145 | 100,108
Available for sale securities | 2,430 | 2,446
Trading securities | 60,584 | 71,682
Total assets measured at fair value | 189,430 | 173,499
Fair value measured on a recurring basis | Level 1 | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 271 | (737)
Fair value measured on a recurring basis | Level 2 |  |
Fair value measurements |  |
Available for sale securities | 132,071 | 128,901
Total assets measured at fair value | 129,445 | 126,962
Fair value measured on a recurring basis | Level 2 | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | $ (2,626) | $ (1,939)

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