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Leases - Components of Lease Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease expense $ 60,450 $ 60,921
Sublease income (2,815) (4,716)
Total net lease costs $ 57,635 $ 56,205