Fair Value Measurements - Schedule of Investments in Debt Securities Held by Decommissioning Trust Fund (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Fair Value Measurements
Purchases	$ 11,843	$ 12,206
Net Proceeds	32	(604)
Unrealized Gain (Loss)	(88)	109
Debt securities held in decommissioning trust fund
Fair Value Measurements
Purchases	11,843	12,206
Net Proceeds	0	0
Unrealized Gain (Loss)	(88)	109
Cash and cash equivalents
Fair Value Measurements
Purchases	0	0
Net Proceeds	7	(747)
Unrealized Gain (Loss)	0	0
Other
Fair Value Measurements
Purchases	0	0
Net Proceeds	25	143
Unrealized Gain (Loss)	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

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