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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows used in operating leases $ 21,918 $ 17,806
Right-of-use assets obtained in exchange for lease obligations:    
Operating leases $ 298 $ 42,405