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Consolidated Statements of Stockholders' Equity - 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 | 50,377 |  |  |  | 50,377 |
Other comprehensive income (loss) | 322 |  |  |  |  | 322
Share repurchases | (19,735) |  | $ (19,735) |  |  |
Share repurchases, Shares |  |  | 1,337 |  |  |
Restricted stock |  | $ 3 |  | (3) |  |
Restricted stock, Shares |  | 292 |  |  |  |
Stock options exercised | 8,008 | $ 12 |  | 7,996 |  |
Stock options exercised, Shares |  | 1,176 |  |  |  |
Share-based compensation | 5,705 |  |  | 5,705 |  |
Business acquisitions | 6,181 | $ 4 |  | 6,177 |  |
Business acquisitions, Shares |  | 416 |  |  |  |
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 adjustment | 2,091 |  |  |  | 2,091 |
Adjusted balance, Amount at January 1, 2018 | 532,970 | $ 1,301 | $ (491,046) | 675,504 | 347,393 | (182)
Adjusted balance, Shares at January 1, 2018 |  | 130,075 | 75,484 |  |  |
Net income | 61,570 |  |  |  | 61,570 |
Other comprehensive income (loss) | (300) |  |  |  |  | (300)
Share repurchases | (17,484) |  | $ (17,484) |  |  |
Share repurchases, Shares |  |  | 848 |  |  |
Restricted stock |  | $ 3 |  | (3) |  |
Restricted stock, Shares |  | 272 |  |  |  |
Stock options exercised | 6,291 | $ 8 |  | 6,283 |  |
Stock options exercised, Shares |  | 864 |  |  |  |
Share-based compensation | 6,866 |  |  | 6,866 |  |
Business acquisitions | 3,750 | $ 2 |  | 3,748 |  |
Business acquisitions, Shares |  | 193 |  |  |  |
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 (Note 1) |  |  |  |  | (101) | 101
Net income | 70,714 |  |  |  | 70,714 |
Other comprehensive income (loss) | (299) |  |  |  |  | (299)
Share repurchases | (27,163) |  | $ (27,163) |  |  |
Share repurchases, Shares |  |  | 1,305 |  |  |
Restricted stock |  | $ 2 |  | (2) |  |
Restricted stock, Shares |  | 228 |  |  |  |
Stock options exercised | $ 10,608 | $ 12 |  | 10,596 |  |
Stock options exercised, Shares | 1,210 | 1,210 |  |  |  |
Share-based compensation | $ 7,254 |  |  | 7,254 |  |
Business acquisitions | 4,461 | $ 3 |  | 4,458 |  |
Business acquisitions, Shares |  | 214 |  |  |  |
Balance, Amount at Dec. 31, 2019 | $ 659,238 | $ 1,331 | $ (535,693) | $ 714,704 | $ 479,576 | $ (680)
Balance, Shares at Dec. 31, 2019 |  | 133,056 | 77,637 |  |  |

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