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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value measurements |  |
Available for sale securities | $ 171,596 | $ 164,183
Trading securities | 60,520 | 67,995
Fair value measured on a recurring basis |  |
Fair value measurements |  |
Cash and cash equivalents | 96,314 | 119,145
Available for sale securities | 171,596 | 164,183
Trading securities | 60,520 | 67,995
Total assets measured at fair value | 328,541 | 352,950
Fair value measured on a recurring basis | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | 79 | (119)
Fair value measured on a recurring basis | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 32 | 1,746
Fair value measured on a recurring basis | Level 1 |  |
Fair value measurements |  |
Cash and cash equivalents | 96,314 | 119,145
Available for sale securities | 1,200 | 2,419
Trading securities | 60,520 | 67,995
Total assets measured at fair value | 158,066 | 191,305
Fair value measured on a recurring basis | Level 1 | Commodity futures contracts |  |
Fair value measurements |  |
Derivative instruments, net | 32 | 1,746
Fair value measured on a recurring basis | Level 2 |  |
Fair value measurements |  |
Available for sale securities | 170,396 | 161,764
Total assets measured at fair value | 170,475 | 161,645
Fair value measured on a recurring basis | Level 2 | Foreign currency forward contracts |  |
Fair value measurements |  |
Derivative instruments, net | $ 79 | $ (119)

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