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Note 2 - Acquisitions and Dispositions - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
The 2016 Acquisitions [Member] |  |  |
Revenue (less agency commissions) | $ 825,787 | $ 701,550 |
Net income | $ 57,795 | $ 39,360 |
Basic net income per share (in dollars per share) | $ 0.80 | $ 0.58 |
Diluted net income per share (in dollars per share) | $ 0.79 | $ 0.57 |
The 2015 Acquisitions [Member] |  |  |
Revenue (less agency commissions) |  | $ 621,530 | $ 559,538
Net income |  | $ 46,181 | $ 59,342
Basic net income per share (in dollars per share) |  | $ 0.68 | $ 1.03
Diluted net income per share (in dollars per share) |  | $ 0.67 | $ 1.02
Hoak and SJL [Member] |  |  |
Revenue (less agency commissions) |  |  | $ 565,251
Net income |  |  | $ 50,771
Basic net income per share (in dollars per share) |  |  | $ 0.88
Diluted net income per share (in dollars per share) |  |  | $ 0.87

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