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Note 7. Restricted Marketable Securities (Details) - Available For Sale - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 172,836	$ 157,158
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gains, before Tax	0	88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Losses, before Tax	1,253	1,705
Debt Securities, Available-for-sale, Allowance for Credit Losses	0	46
Restricted marketable securities	199,136	198,310
Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	256,966	253,834
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gains, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Losses, before Tax	57,830	55,480
Debt Securities, Available-for-sale, Allowance for Credit Losses	0	44
Restricted marketable securities	$ 199,136	198,310
Minimum [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Contractual maturities of available-for-sale marketable securities, range start (in years)	6 years
Maximum [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Contractual maturities of available-for-sale marketable securities, range end (in years)	15 years
U.S. debt [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 10,000	45,625
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gains, before Tax	0	88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Losses, before Tax	1,253	1,614
Debt Securities, Available-for-sale, Allowance for Credit Losses	0	10
U.S. debt [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	144,652	146,484
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gains, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Losses, before Tax	35,497	33,129
Debt Securities, Available-for-sale, Allowance for Credit Losses	0	29
Restricted marketable securities	109,155	113,326
Foreign government obligations [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	62,595	65,202
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gains, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Losses, before Tax	13,571	13,963
Debt Securities, Available-for-sale, Allowance for Credit Losses	0	10
Restricted marketable securities	49,024	51,229
Supranational debt [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25,351	17,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gains, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Losses, before Tax	2,542	2,349
Debt Securities, Available-for-sale, Allowance for Credit Losses	0	0
Restricted marketable securities	22,809	15,339
U.S. government obligations [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	24,368	24,460
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gains, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Losses, before Tax	6,220	6,039
Debt Securities, Available-for-sale, Allowance for Credit Losses	0	5
Restricted marketable securities	$ 18,148	$ 18,416

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Contractual Maturities Of Debt securities, Available-for-sale, Range End (In Years)

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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