Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Fair Value Measurements
Cash and cash equivalents	$ 62,080	$ 127,165	$ 120,521
Fair value measured on a recurring basis
Fair Value Measurements
Cash and cash equivalents	62,080	127,165	120,521
Available for sale securities	380,105	365,041	271,627
Trading securities	130,723	121,541	112,009
Total assets measured at fair value	572,365	612,091	503,766
Fair value measured on a recurring basis \| Foreign currency derivatives
Fair Value Measurements
Derivative instruments, net	(231)	92	239
Fair value measured on a recurring basis \| Commodity derivatives
Fair Value Measurements
Derivative instruments, net	(312)	(1,748)	(630)
Fair value measured on a recurring basis \| Level 1
Fair Value Measurements
Cash and cash equivalents	62,080	127,165	120,521
Available for sale securities	11,423	2,961	4,143
Trading securities	114,489	104,642	95,499
Total assets measured at fair value	187,680	233,020	219,533
Fair value measured on a recurring basis \| Level 1 \| Commodity derivatives
Fair Value Measurements
Derivative instruments, net	(312)	(1,748)	(630)
Fair value measured on a recurring basis \| Level 2
Fair Value Measurements
Available for sale securities	368,682	362,080	267,484
Trading securities	16,234	16,899	16,510
Total assets measured at fair value	384,685	379,071	284,233
Fair value measured on a recurring basis \| Level 2 \| Foreign currency derivatives
Fair Value Measurements
Derivative instruments, net	$ (231)	$ 92	$ 239

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 cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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

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