Long-Term Debt - Outstanding Debt Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Maturities of outstanding debt
2024	$ 460,694
2025	400,653
2026	400,453
2027	350,036
Thereafter	1,500,000
Total debt	3,111,836	$ 3,113,726
Interest costs
Interest costs incurred	109,500	107,400	$ 107,700
Interest costs incurred capitalized	$ 33,000	$ 15,800	$ 50,500

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Amount of interest capitalized, including amount of allowance for funds used during construction.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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