Fair Value of Financial Instruments - Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Consolidated assets	$ 8,745,353	$ 9,373,511
Liabilities	6,055,329	6,652,250
Other long-term assets	425,493	418,485
Reporting entity involvement, maximum loss exposure, amount	36,000	35,000
Variable Interest Entity, Primary Beneficiary
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Consolidated assets	16,100		$ 1,700
Liabilities	14,400		$ 1,600
Variable Interest Entity, Not Primary Beneficiary
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Other long-term assets	$ 24,000	$ 23,000
Electric Utility Company One
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Variable interest entity, percent	49.00%