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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | ---
Fair value measurements |  |  |
Cash and cash equivalents | $ 57,216 | $ 105,840 | $ 76,210
Fair value measured on a recurring basis |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 57,216 | 105,840 | 76,210
Available for sale securities | 262,159 | 241,407 | 235,912
Trading securities | 67,659 | 89,736 | 83,905
Total assets measured at fair value | 386,637 | 437,533 | 396,883
Fair value measured on a recurring basis | Foreign currency forward contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | (366) | 426 | 504
Fair value measured on a recurring basis | Commodity futures contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | (31) | 124 | 352
Fair value measured on a recurring basis | Level 1 |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 57,216 | 105,840 | 76,210
Available for sale securities | 742 | 1,282 | 2,313
Trading securities | 52,900 | 76,196 | 70,762
Total assets measured at fair value | 110,827 | 183,442 | 149,637
Fair value measured on a recurring basis | Level 1 | Commodity futures contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | (31) | 124 | 352
Fair value measured on a recurring basis | Level 2 |  |  |
Fair value measurements |  |  |
Available for sale securities | 261,417 | 240,125 | 233,599
Trading securities | 14,759 | 13,540 | 13,143
Total assets measured at fair value | 275,810 | 254,091 | 247,246
Fair value measured on a recurring basis | Level 2 | Foreign currency forward contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | $ (366) | $ 426 | $ 504

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