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Debt - Maturities for long-term debt and finance lease obligations and debt outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Maturities for finance leases    
2023 $ 14,949  
2024 14,949  
2025 14,949  
2026 14,949  
2027 14,949  
Maturities for contractual obligations    
2023 322,103  
2024 381,753  
2025 355,312  
2026 336,888  
2027 347,035  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 11,940,359 $ 10,915,054
Long-term debt    
Maturities for long-term debt    
2023 313,705  
2024 372,402  
2025 344,899  
2026 325,293  
2027 $ 334,123  
Maturities for contractual obligations    
Weighted average interest rate on long-term debt 3.78% 3.69%
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal $ 11,940,359 $ 10,915,054
Unamortized Debt Issuance Costs and Debt Discounts 114,142 111,909
Finance Leases    
Maturities for finance leases    
2023 8,398  
2024 9,351  
2025 10,413  
2026 11,595  
2027 12,912  
FFB | Long-term debt    
Maturities for long-term debt    
2023 312,695  
2024 308,892  
2025 282,399  
2026 262,793  
2027 271,623  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 7,084,148 6,526,858
Unamortized Debt Issuance Costs and Debt Discounts 52,690 55,159
FMBs | Long-term debt    
Maturities for long-term debt    
2023 1,010  
2024 63,510  
2025 62,500  
2026 62,500  
2027 62,500  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 4,152,021 3,653,031
Unamortized Debt Issuance Costs and Debt Discounts 52,480 46,985
PCRBs | Long-term debt    
Maturities for long-term debt    
2023 0  
2024 0  
2025 0  
2026 0  
2027 0  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 704,190 735,165
Unamortized Debt Issuance Costs and Debt Discounts $ 8,972 $ 9,765