Cash Equivalents - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash and Cash Equivalents
Accretion (amortization) of premiums and discounts on investments	$ 0	$ 0	$ 412,000
Unrealized gains (losses)	3,490,000	8,022,000	5,291,000
Allowance for credit losses	0	0	0
Accrued interest receivables	0
Reclassification out of Accumulated Other Comprehensive Income
Cash and Cash Equivalents
Unrealized gains (losses)	0	0	0
Interest Income
Cash and Cash Equivalents
Interest income on investments	3,500,000	7,600,000	4,400,000
Other Nonoperating Income (Expense)
Cash and Cash Equivalents
Accretion (amortization) of premiums and discounts on investments	$ 0	$ 0	$ 400,000