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Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2016 - 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, 2015 | $ 427,948 | $ 1,262 | $ (462,167) | $ 634,626 | $ 254,860 | $ (633)
Balance, Shares at Dec. 31, 2015 |  | 126,182 | 73,228 |  |  |
Net income | 29,897 |  |  |  | 29,897 |
Other comprehensive loss | (441) |  |  |  |  | (441)
Share repurchases | (7,828) |  | $ (7,828) |  |  |
Share repurchases, Shares |  |  | 799 |  |  |
Restricted stock |  | $ 4 |  | (4) |  |
Restricted stock, Shares |  | 302 |  |  |  |
Stock options exercised | $ 3,529 | $ 5 |  | 3,524 |  |
Stock options exercised, Shares | 510 | 510 |  |  |  |
Share-based compensation | $ 2,842 |  |  | 2,842 |  |
Tax benefit from employee share plans | 663 |  |  | 663 |  |
Business acquisitions | 3,815 | $ 4 |  | 3,811 |  |
Business acquisitions, Shares |  | 372 |  |  |  |
Balance, Amount at Jun. 30, 2016 | $ 460,425 | $ 1,275 | $ (469,995) | $ 645,462 | $ 284,757 | $ (1,074)
Balance, Shares at Jun. 30, 2016 |  | 127,366 | 74,027 |  |  |

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