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Fair Value - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value Disclosures [Abstract]    
Total assets and liabilities measured at fair value $ 26,500,000 $ 26,500,000
Total assets and liabilities measured at fair value priced using non-binding broker quotes $ 187,600 $ 150,100
Total assets and liabilities measured at fair value priced using non-binding broker quotes (percentage) 0.70% 0.60%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Senior notes $ 2,861,728 $ 2,861,113
Estimated fair value of senior notes $ 3,500,000 $ 3,700,000