Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Fair Value Measurements
Cash and cash equivalents	$ 64,886	$ 75,915	$ 37,992
Fair value measured on a recurring basis
Fair Value Measurements
Cash and cash equivalents	64,886	75,915	37,992
Available for sale securities	277,471	263,313	262,729
Trading securities	95,957	87,800	76,039
Total assets measured at fair value	437,726	424,804	376,578
Fair value measured on a recurring basis \| Foreign currency derivatives.
Fair Value Measurements
Derivative instruments, net	(29)	302	(233)
Fair value measured on a recurring basis \| Commodity derivatives
Fair Value Measurements
Derivative instruments, net	(559)	(2,526)	51
Fair value measured on a recurring basis \| Level 1
Fair Value Measurements
Cash and cash equivalents	64,886	75,915	37,992
Available for sale securities	4,038	4,084	4,583
Trading securities	78,362	70,681	59,952
Total assets measured at fair value	146,727	148,154	102,578
Fair value measured on a recurring basis \| Level 1 \| Commodity derivatives
Fair Value Measurements
Derivative instruments, net	(559)	(2,526)	51
Fair value measured on a recurring basis \| Level 2
Fair Value Measurements
Available for sale securities	273,433	259,229	258,146
Trading securities	17,595	17,119	16,087
Total assets measured at fair value	290,999	276,650	274,000
Fair value measured on a recurring basis \| Level 2 \| Foreign currency derivatives.
Fair Value Measurements
Derivative instruments, net	$ (29)	$ 302	$ (233)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fair value of asset after deduction of liability.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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