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Note 9 - Leases - Lease Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating lease cost $ 82,643 $ 77,394
Amortization of right-of-use assets 898 920
Interest on lease liabilities 17 19
Variable lease cost 25,297 26,030
Short term lease cost 3,662 4,712
Total lease expense 112,517 109,075
Sublease revenues (2,844) (3,124)
Total lease cost, net of sublease revenues 109,673 105,951
Operating leases recognized on transition to ASC 842 330,603 299,090
Right-of-use assets obtained in exchange for new operating lease obligations 91,575 36,945
Right-of-use assets obtained in exchange for new finance lease obligations 2,160 400
Operating cash flows from operating leases (83,351) (79,764)
Operating cash flows from finance leases (17) (19)
Financing cash flows from finance leases $ (884) (874)
Operating leases (years) (Year) 5 years 146 days  
Finance leases (years) (Year) 2 years  
Operating leases 3.10%  
Finance leases 1.50%  
Accounting Standards Update 2016-02 [Member]    
Operating leases recognized on transition to ASC 842 $ 274,696