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Debt - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Outstanding balance $ 5,666,052 $ 5,913,065
Weighted-average years to maturity 5 years 6 months  
Weighted-average interest rate 3.86%