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Note 17 - Stockholders' Equity (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Equity, Attributable to Parent $ 2,830,313 $ 2,638,736 $ 2,830,313 $ 2,638,736 $ 2,793,242 $ 2,736,575 $ 2,602,671 $ 2,474,040
Stockholders' Equity, Period Increase (Decrease)     93,700          
Net Income (Loss) Attributable to Parent 67,514 82,371 205,778 271,598        
Other Comprehensive Income (Loss), Net of Tax 26,607 (24,484) 18,963 (21,238)        
Share-Based Payment Arrangement, Expense     4,100          
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan     2,217 2,700        
Stock Issued During Period, Value, Issued for Services   0 850 850        
Dividends, Common Stock, Cash 24,331 24,672 73,804 73,938        
Treasury Stock, Value, Acquired, Cost Method     60,600          
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation 13 11 3,722 3,538        
Restricted Stock Units (RSUs) [Member]                
Share-Based Payment Arrangement, Expense $ 1,900 $ 2,000 4,100 $ 5,000        
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation     $ 3,700