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Fair value of financial and nonfinancial obligations.

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Fair Value of Financial Instruments (Details) - USD ($)	3 Months Ended
Fair Value of Financial Instruments (Details) - USD ($)	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Assets, Fair Value Disclosure [Abstract]
Available-for-sale, operating	$ 2,300,000	$ 600,000
Level 1 \| Fair value, recurring
Assets, Fair Value Disclosure [Abstract]
Financial assets held in marketable securities	146,900,000		$ 65,600,000
Level 2
Assets, Fair Value Disclosure [Abstract]
Assets classified as level 2 or level 3, fair value	0
Liabilities classified as level 2 or level 3, fair value			0
Level 3
Assets, Fair Value Disclosure [Abstract]
Assets classified as level 2 or level 3, fair value			0
Liabilities classified as level 2 or level 3, fair value	0
Money Market Funds \| Level 1 \| Fair value, recurring
Assets, Fair Value Disclosure [Abstract]
Financial assets held in money market accounts	$ 111,900,000		$ 167,700,000