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Operating Leases - Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]    
Cash paid for amounts included in the measurement of operating lease liabilities $ 56,570 $ 56,165
Leased assets obtained in exchange for new operating lease liabilities $ 49,209 $ 46,096