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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value measurements |  |
Cash and cash equivalents | $ 138,960 | $ 110,899
Available for sale securities | 177,292 | 183,289
Trading securities | 76,183 | 62,260
Fair value measured on a recurring basis |  |
Fair value measurements |  |
Cash and cash equivalents | 138,960 | 110,899
Available for sale securities | 177,292 | 183,289
Trading securities | 76,183 | 62,260
Total assets measured at fair value | 392,570 | 355,454
Fair value measured on a recurring basis | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | 14 | (407)
Fair value measured on a recurring basis | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 121 | (587)
Fair value measured on a recurring basis | Level 1 |  |
Fair value measurements |  |
Cash and cash equivalents | 138,960 | 110,899
Available for sale securities | 3,588 | 3,007
Trading securities | 48,260 | 36,753
Total assets measured at fair value | 190,929 | 150,072
Fair value measured on a recurring basis | Level 1 | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 121 | (587)
Fair value measured on a recurring basis | Level 2 |  |
Fair value measurements |  |
Available for sale securities | 173,704 | 180,282
Trading securities | 27,923 | 25,507
Total assets measured at fair value | 201,641 | 205,382
Fair value measured on a recurring basis | Level 2 | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | $ 14 | $ (407)

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