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Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 336,973 | $ 481 | $ 201,389 | $ (46) | $ 261,150 | $ (126,001)
Balance, shares at Dec. 31, 2014 |  | 48,148 |  |  |  | (14,679)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 64,869 |  |  |  | 64,869 |
Issuance of shares pursuant to stock compensation plan | $ 23,160 |  | 4,332 |  |  | $ 18,828
Issuance of shares pursuant to stock compensation plan, shares | 1,118 |  |  |  |  | 1,118
Stock compensation | $ 20,182 |  | 20,182 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 4,671 |  | 3,879 |  |  | $ 792
Issuance of shares pursuant to employee stock purchase plan, shares | 43 |  |  |  |  | 43
Federal income tax benefit related to exercise of stock options | $ 45,314 |  | 45,314 |  |  |
Treasury stock purchases | $ (645) |  |  |  |  | $ (645)
Treasury stock purchases, shares | (5) |  |  |  |  | (5)
Issuance of shares for acquisitions | $ 364,333 |  | 332,659 |  |  | $ 31,674
Issuance of shares for acquisitions, shares | 2,149 |  |  |  |  | 2,149
Balance at Dec. 31, 2015 | $ 858,857 | $ 481 | 607,755 | (46) | 326,019 | $ (75,352)
Balance, shares at Dec. 31, 2015 |  | 48,148 |  |  |  | (11,374)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 109,857 |  |  |  | 109,857 |
Issuance of shares pursuant to stock compensation plan | $ 23,527 |  | (82,273) |  |  | $ 105,800
Issuance of shares pursuant to stock compensation plan, shares | 827 |  |  |  |  | 827
Stock compensation | $ 29,747 |  | 29,747 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 6,236 |  | 1,434 |  |  | $ 4,802
Issuance of shares pursuant to employee stock purchase plan, shares | 47 |  |  |  |  | 47
Treasury stock purchases | $ (112,699) |  |  |  |  | $ (112,699)
Treasury stock purchases, shares | (882) |  |  |  |  | (882)
Balance at Dec. 31, 2016 | $ 915,525 | $ 481 | 556,663 | (46) | 435,876 | $ (77,449)
Balance, shares at Dec. 31, 2016 |  | 48,148 |  |  |  | (11,382)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 163,945 |  |  |  | 163,945 |
Issuance of shares pursuant to stock compensation plan | $ 49,845 |  | 28,174 |  |  | $ 21,671
Issuance of shares pursuant to stock compensation plan, shares | 1,113 |  |  |  |  | 1,113
Stock compensation | $ 37,348 |  | 37,348 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 7,044 |  | 4,682 |  |  | $ 2,362
Issuance of shares pursuant to employee stock purchase plan, shares | 51 |  |  |  |  | 51
Treasury stock purchases | $ (6,613) |  |  |  |  | $ (6,613)
Treasury stock purchases, shares | (44) |  |  |  |  | (44)
Balance at Dec. 31, 2017 | $ 1,167,094 | $ 481 | $ 626,867 | $ (46) | $ 599,821 | $ (60,029)
Balance, shares at Dec. 31, 2017 |  | 48,148 |  |  |  | (10,262)

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