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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Fair value measurements |  |  |
Cash and cash equivalents | $ 136,291 | $ 166,841 | $ 139,067
Fair value measured on a recurring basis |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 136,291 | 166,841 | 139,067
Available for sale securities | 207,874 | 188,282 | 162,080
Trading securities | 78,271 | 73,828 | 68,717
Total assets measured at fair value | 423,861 | 430,670 | 369,291
Fair value measured on a recurring basis | Foreign currency forward contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | 755 | 778 | (93)
Fair value measured on a recurring basis | Commodity futures contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | 670 | 941 | (480)
Fair value measured on a recurring basis | Level 1 |  |  |
Fair value measurements |  |  |
Cash and cash equivalents | 136,291 | 166,841 | 139,067
Available for sale securities | 3,144 | 3,149 | 3,441
Trading securities | 65,532 | 61,431 | 41,692
Total assets measured at fair value | 205,637 | 232,362 | 183,720
Fair value measured on a recurring basis | Level 1 | Commodity futures contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | 670 | 941 | (480)
Fair value measured on a recurring basis | Level 2 |  |  |
Fair value measurements |  |  |
Available for sale securities | 204,730 | 185,133 | 158,639
Trading securities | 12,739 | 12,397 | 27,025
Total assets measured at fair value | 218,224 | 198,308 | 185,571
Fair value measured on a recurring basis | Level 2 | Foreign currency forward contracts |  |  |
Fair value measurements |  |  |
Derivative instruments, net | $ 755 | $ 778 | $ (93)

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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