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Leases (Components of Lease Expense) (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 $ 6,173 $ 16,888 $ 23,976 $ 33,106
Short-term lease cost 712 264 2,653 1,357
Total lease cost $ 6,885 $ 17,152 $ 26,629 $ 34,463