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Intangibles - Future amortization expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Future amortization expense    
Total $ 1,233,099 $ 1,286,103
Customer relationships    
Future amortization expense    
Remainder of year ending December 31, 2023 17,668  
Year ending December 31, 2024 70,672  
Year ending December 31, 2025 70,672  
Year ending December 31, 2026 70,672  
Year ending December 31, 2027 70,672  
Thereafter 932,743  
Total $ 1,233,099 $ 1,286,103