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Fair Value - Estimated fair value of long-term debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Carrying Value    
Fair Value    
Long-term debt $ 11,966,572 $ 12,096,552
Fair Value | (Level 2)    
Fair Value    
Long-term debt $ 10,233,768 $ 10,638,749