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Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2017 - 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, 2016 | $ 480,021 | $ 1,282 | $ (471,311) | $ 655,629 | $ 294,925 | $ (504)
Balance, Shares at Dec. 31, 2016 |  | 128,191 | 74,147 |  |  |
Net income | 35,872 |  |  |  | 35,872 |
Other comprehensive income | 217 |  |  |  |  | 217
Share repurchases | (5,675) |  | $ (5,675) |  |  |
Share repurchases, Shares |  |  | 400 |  |  |
Restricted stock |  | $ 3 |  | (3) |  |
Restricted stock, Shares |  | 294 |  |  |  |
Stock options exercised | $ 5,649 | $ 8 |  | 5,641 |  |
Stock options exercised, Shares | 805 | 805 |  |  |  |
Share-based compensation | $ 2,790 |  |  | 2,790 |  |
Business acquisitions | 4,488 | $ 3 |  | 4,485 |  |
Business acquisitions, Shares |  | 312 |  |  |  |
Balance, Amount at Jun. 30, 2017 | $ 523,362 | $ 1,296 | $ (476,986) | $ 668,542 | $ 330,797 | $ (287)
Balance, Shares at Jun. 30, 2017 |  | 129,602 | 74,547 |  |  |

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