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Leases - Components of Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease expense $ 17,795 $ 15,335 $ 49,883 $ 45,074
Sublease income (682) (755) (2,010) (2,290)
Total net lease costs $ 17,113 $ 14,580 $ 47,873 $ 42,784