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Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Investments
Investments - Available-for-sale	$ 94,485		$ 98,031
Available-for-sale investments
Adjusted Cost	94,634
Gross Unrealized Gains	159
Gross Unrealized (Losses)	(308)
Estimated Fair Value	94,485
Net unrealized gains and losses on available-for-sale debt securities	56	$ (119)
Corporate bonds
Available-for-sale investments
Adjusted Cost	79,633
Gross Unrealized Gains	155
Gross Unrealized (Losses)	(295)
Estimated Fair Value	79,493
Agency bonds
Available-for-sale investments
Adjusted Cost	15,001
Gross Unrealized Gains	4
Gross Unrealized (Losses)	(13)
Estimated Fair Value	$ 14,992

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