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Debt - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Outstanding debt $ 4,666,000 $ 3,343,000
Debt issuance costs 52,000 15,000
Net unamortized discount 90,000 6,000
Face value of outstanding debt 4,781,437 3,282,195
Line of Credit    
Line of Credit Facility [Line Items]    
Outstanding letters of credit 10,000 12,000
Line of Credit | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Face value of outstanding debt $ 375,000 $ 0