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v3.19.1

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | ---
Balance, Amount at Dec. 31, 2017 | $ 530,879 | $ 1,301 | $ (491,046) | $ 675,504 | $ 345,302 | $ (182)
Balance, Shares at Dec. 31, 2017 |  | 130,075 | 75,484 |  |  |
Cumulative-effect of accounting changes adjustment | 1,622 |  |  |  | 1,622 |
Net income | 35,851 |  |  |  | 35,851 |
Other comprehensive income | 114 |  |  |  |  | 114
Share repurchases | (558) |  | $ (558) |  |  |
Share repurchases, Shares |  |  | 31 |  |  |
Stock options exercised | 2,271 | $ 4 |  | 2,267 |  |
Stock options exercised, Shares |  | 339 |  |  |  |
Share-based compensation | 1,437 |  |  | 1,437 |  |
Share-based compensation, Shares |  | 56 |  |  |  |
Balance, Amount at Mar. 31, 2018 | 571,616 | $ 1,305 | $ (491,604) | 679,208 | 382,775 | (68)
Balance, Shares at Mar. 31, 2018 |  | 130,470 | 75,515 |  |  |
Balance, Amount at Dec. 31, 2018 | 593,663 | $ 1,314 | $ (508,530) | 692,398 | 408,963 | (482)
Balance, Shares at Dec. 31, 2018 |  | 131,404 | 76,332 |  |  |
Cumulative-effect of accounting changes adjustment | ASU 2018-02 [Member] |  |  |  |  | (101) | 101
Net income | 37,469 |  |  |  | 37,469 |
Other comprehensive income | 81 |  |  |  |  | 81
Share repurchases | (11,558) |  | $ (11,558) |  |  |
Share repurchases, Shares |  |  | 580 |  |  |
Restricted Stock |  | $ 1 |  | (1) |  |
Restricted Stock, Shares |  | 173 |  |  |  |
Stock options exercised | $ 1,400 | $ 2 |  | 1,398 |  |
Stock options exercised, Shares | 189 | 189 |  |  |  |
Share-based compensation | $ 1,482 |  |  | 1,482 |  |
Business acquisitions | 950 | $ 1 |  | 949 |  |
Business acquisitions, Shares |  | 47 |  |  |  |
Balance, Amount at Mar. 31, 2019 | $ 623,487 | $ 1,318 | $ (520,088) | $ 696,226 | $ 446,331 | $ (300)
Balance, Shares at Mar. 31, 2019 |  | 131,813 | 76,912 |  |  |

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