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Leases - Leases 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 cost $ 13,807 $ 8,085 $ 32,954 $ 25,298
Amortization of right of use assets 153 126 466 433
Interest on lease liabilities 722 697 2,229 1,977
Total finance lease cost 875 823 2,695 2,410
Short-term lease cost 2,949 3,427 7,729 9,824
Variable lease cost 2,441 2,312 6,619 6,344
Total lease cost $ 20,072 $ 14,647 $ 49,997 $ 43,876