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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 |

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- Definition Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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