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Intangibles - Customer Relationships (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Finite lived intangible assets rollforward    
Gross carrying value $ 1,555,000 $ 1,555,000
Accumulated amortization (357,237) (339,569)
Customer relationships $ 1,197,763 $ 1,215,431
Customer relationships | Weighted Average    
Finite lived intangible assets    
Amortization period 18 years