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Operating Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease expense $ 30,038 $ 31,083 $ 90,673 $ 93,355
Variable lease expense 3,656 2,860 10,604 7,114
Total operating lease expense $ 33,694 $ 33,943 $ 101,277 $ 100,469