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Leases - Cash Flow (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Cash paid for amounts included in the measurement of operating lease liabilities $ 96,953 $ 105,015
Right-of-use assets obtained in exchange for new and modified operating lease liabilities $ 41,802 $ 38,795