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Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease right-of-use assets $ 271,515 $ 286,194
Operating lease liabilities $ 271,499 $ 285,991
Weighted average remaining lease term 17 years 17 years
Weighted average discount rate% 3.18% 3.23%