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Debt - Maturities for long-term debt and finance lease obligations and debt outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Maturities for finance leases    
2024 $ 14,949  
2025 14,949  
2026 14,949  
2027 14,949  
2028 3,052  
Maturities for contractual obligations    
2024 384,426  
2025 357,627  
2026 339,272  
2027 317,589  
2028 $ 347,742  
Weighted average interest rate on short-term borrowings (as a percent) 5.72% 4.84%
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal $ 12,096,552 $ 11,940,359
Long-term debt    
Maturities for long-term debt    
2024 375,075  
2025 347,214  
2026 327,677  
2027 304,677  
2028 $ 345,589  
Maturities for contractual obligations    
Weighted average interest rate on long-term debt 3.89% 3.78%
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal $ 12,096,552 $ 11,940,359
Unamortized Debt Issuance Costs and Debt Discounts 120,560 114,142
Finance Leases    
Maturities for finance leases    
2024 9,351  
2025 10,413  
2026 11,595  
2027 12,912  
2028 2,153  
FFB | Long-term debt    
Maturities for long-term debt    
2024 311,565  
2025 284,714  
2026 265,177  
2027 242,177  
2028 283,089  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 6,841,352 7,084,148
Unamortized Debt Issuance Costs and Debt Discounts 51,083 52,690
FMBs | Long-term debt    
Maturities for long-term debt    
2024 63,510  
2025 62,500  
2026 62,500  
2027 62,500  
2028 62,500  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 4,551,010 4,152,021
Unamortized Debt Issuance Costs and Debt Discounts 60,987 52,480
PCRBs | Long-term debt    
Maturities for long-term debt    
2024 0  
2025 0  
2026 0  
2027 0  
2028 0  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 704,190 704,190
Unamortized Debt Issuance Costs and Debt Discounts $ 8,490 $ 8,972