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Note 9 - Capital Resources (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 07, 2019 | Dec. 31, 2017
Stockholders' Equity Attributable to Parent, Ending Balance | $ 2,418,144 |  |  |  | $ 2,294,283 |  |  |  | $ 2,418,144 | $ 2,294,283 | $ 2,121,866 |  | $ 1,973,304
Stockholders' Equity, Period Increase (Decrease), Total |  |  |  |  |  |  |  |  | $ 123,900 |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Percentage |  |  |  |  |  |  |  |  | 5.40% |  |  |  |
Net Income (Loss) Attributable to Parent, Total | $ 70,893 | $ 56,794 | $ 54,321 | $ 46,852 | $ 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | $ 228,860 | 279,135 | 271,885 |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  | 9,777 | 3,366 | 2,822 |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | 5,600 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Total |  |  |  |  |  |  |  |  | 3,008 | 20,308 | (6,424) |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  | 1,911 | 2,311 | 2,440 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  | 23,593 | 36,301 | 42,648 |  |
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  | $ 98,688 | $ 99,131 | 83,446 |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.24 |  |  |
May 2019 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  | $ 50,000 | $ 26,400 |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  |  |  | 1,541,912 | 741,934 |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 32.43 | $ 35.59 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | $ 6,600 | $ 7,300 |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |

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