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Note 9 - Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating leases, one year $ 87,112  
Operating leases, two years 74,269  
Operating leases, three years 59,617  
Operating leases, four years 46,302  
Operating leases, five years 33,393  
Operating leases, thereafter 60,239  
Operating leases 360,932  
Present value of operating lease liabilities 330,603 $ 299,090
Difference between undiscounted cash flows and discounted cash flows, operating lease 30,329  
Finance leases, one year 1,115  
Finance leases, two years 855  
Finance leases, three years 470  
Finance leases, four years 9  
Finance leases, five years  
Finance leases, thereafter  
Finance leases 2,449  
Present value of finance lease liabilities 2,429 $ 853
Difference between undiscounted cash flows and discounted cash flows, finance lease $ 20