XML 109 R92.htm IDEA: XBRL DOCUMENT v3.20.4
Fair Value - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 2,861,113 $ 1,871,626
Total assets and liabilities measured at fair value 26,500,000 22,900,000
Total assets and liabilities measured at fair value priced using non-binding broker quotes $ 150,100 $ 179,600
Total assets and liabilities measured at fair value priced using non-binding broker quotes (percentage) 0.60% 0.80%
Unsecured debt | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 2,900,000 $ 1,900,000
Estimated fair value of senior notes $ 3,700,000 $ 2,300,000