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Operating Leases - 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 $ 31,595 $ 30,038 $ 94,034 $ 90,673
Variable lease expense 4,120 3,656 11,893 10,604
Total operating lease expense $ 35,715 $ 33,694 $ 105,927 $ 101,277