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Note 10 - Capital Resources (Details Textual) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Feb. 29, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 26, 2018 | Feb. 01, 2016 | Dec. 31, 2015
Stockholders' Equity Attributable to Parent, Ending Balance |  |  | $ 2,121,866,000 |  |  |  | $ 1,973,304,000 |  |  |  | $ 2,121,866,000 | $ 1,973,304,000 | $ 1,828,539,000 |  |  | $ 1,747,778,000
Stockholders' Equity, Period Increase (Decrease), Total |  |  |  |  |  |  |  |  |  |  | $ 148,600,000 |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease), Percentage |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  | $ 64,648,000 | $ 69,757,000 | $ 73,664,000 | $ 63,816,000 | $ 25,940,000 | $ 49,746,000 | $ 51,415,000 | $ 48,941,000 | $ 271,885,000 | 176,042,000 | 175,099,000 |  |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  | 2,822,000 | 2,528,000 | 2,277,000 |  |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  | 838,000 | 1,094,000 | 7,661,000 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  | 42,648,000 |  | 54,441,000 |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  |  |  | 2,440,000 | 6,813,000 | 103,000 |  |  |
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  |  |  | $ 83,446,000 | $ 69,888,000 | 59,274,000 |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  |  |  |  |  |  |  | $ 1.03 | $ 0.87 |  |  |  |
August 2015 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 633,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 26.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |
February 2016 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |  | $ 37,500,000 |  |  |
Treasury Stock, Shares, Acquired | 200,326 |  |  |  |  |  |  |  |  |  |  |  | 1,380,578 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 37.65 |  |  |  |  |  |  |  |  |  |  |  | $ 27.13 |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |
October 2018 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  | $ 35,100,000 |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  | 913,400 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  | $ 38.43 |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  | 9,900,000 |  |  |  |  |  |  |  | 9,900,000 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 |  |  |  |  |

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