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Leases - Supplemental Cash Flow Information and Non-Cash Activity Related to Operating Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 170,317 $ 167,652
Operating cash flows from finance leases 2,077 1,559
Financing cash flows from finance leases 40,304 31,006
Right-of-use assets obtained in exchange for new operating lease liabilities 177,384 168,972
Right-of-use assets obtained in exchange for new finance lease liabilities 61,218 63,041
Other non-cash increases in operating lease right-of-use assets (17,621) 47,851
Other non-cash decreases in finance lease right-of-use assets $ (1,233) $ (1,826)