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Operating Leases - Supplemental 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 $ 110,965 $ 116,448
Leased assets obtained in exchange for new operating lease liabilities $ 104,576 $ 71,117