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Note 9 - Capital Resources (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 4 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Aug. 05, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 02, 2021 | Apr. 01, 2021 | Dec. 31, 2018
Stockholders' Equity Attributable to Parent, Ending Balance | $ 2,446,251 |  | $ 2,446,251 | $ 2,418,144 | $ 2,294,283 |  |  | $ 2,121,866
Stockholders' Equity, Period Increase (Decrease), Total |  |  | $ 28,100 |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Percentage |  |  | 1.20% |  |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  | $ 298,304 | 228,860 | 279,135 |  |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  | 3,563 | 9,777 | 3,366 |  |  |
Share-based Payment Arrangement, Expense |  |  | 6,000 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Total |  |  | (8,375) | 3,008 | 20,308 |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  | 2,632 | 1,911 | 2,311 |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 92,100 | $ 75,000 | 167,104 | 23,593 | 36,301 |  |  |
Dividends, Common Stock, Cash |  |  | $ 99,322 | $ 98,688 | $ 99,131 |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  |  | $ 1.27 | $ 1.24 | $ 1.24 |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 125,000 | $ 75,000 |
Treasury Stock, Shares, Acquired (in shares) | 2,153,576 | 1,832,481 | 3,986,057 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ 42.77 | $ 40.93 | $ 41.92 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 6,000 | $ 5,600 | $ 6,600 |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  | $ 2,600 |  |  |  |  |

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