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Note 9 - Capital Resources (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 07, 2019 | Oct. 26, 2018 | Dec. 31, 2016
Stockholders' Equity Attributable to Parent, Ending Balance |  | $ 2,294,283 |  |  |  | $ 2,121,866 |  |  |  | $ 2,294,283 | $ 2,121,866 | $ 1,973,304 |  |  | $ 1,828,539
Stockholders' Equity, Period Increase (Decrease), Total |  |  |  |  |  |  |  |  |  | $ 172,400 |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Percentage |  |  |  |  |  |  |  |  |  | 8.10% |  |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  | 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | $ 64,648 | $ 69,757 | $ 73,664 | $ 63,816 | $ 279,135 | 271,885 | 176,042 |  |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  | 3,366 | 2,822 | 2,528 |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | 6,600 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Total |  |  |  |  |  |  |  |  |  | 20,308 | (6,424) | 1,204 |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  | 2,311 | 2,440 | 6,813 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  | 36,301 | 42,648 |  |  |  |
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  |  | $ 99,131 | $ 83,446 | 69,888 |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.03 |  |  |  |
February 2016 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000 |
October 2018 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 45,000 |  |  |  |  |  |  |  |  |  | $ 35,100 |  |  |  |
Treasury Stock, Shares, Acquired | 1,182,060 |  |  |  |  |  |  |  |  |  | 913,400 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 38.07 |  |  |  |  |  |  |  |  |  | $ 38.43 |  |  |  |
May 2019 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  | $ 26,400 |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  | 741,934 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  | $ 35.59 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 23,600 |  |  |  |  |  |  |  | $ 23,600 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | 6,600 | $ 7,300 | $ 5,200 |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |  |

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