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Fair Value - Estimated fair value of long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Carrying Value    
Fair Value    
Long-term debt $ 12,096,552 $ 11,940,359
Fair Value | Significant Other Observable Inputs (Level 2)    
Fair Value    
Long-term debt $ 10,638,749 $ 10,194,954