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Note 18 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Stockholders' Equity Attributable to Parent, Ending Balance | $ 2,463,289 | $ 2,313,037 | $ 2,418,144 | $ 2,294,283
Stockholders' Equity, Period Increase (Decrease), Total | 45,100 |  |  |
Net Income (Loss) Attributable to Parent, Total | 73,384 | 46,852 |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan | 868 | 846 |  |
Dividends, Common Stock, Cash | 24,650 | 24,660 |  |
Other Comprehensive Income (Loss), Net of Tax, Total | $ (3,624) | $ 7,575 |  |

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