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Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 145,299 | $ 481 | $ 154,018 | $ (268) | $ 163,109 | $ (172,041)
Balance, shares at Dec. 31, 2012 |  | 48,148 |  |  |  | (16,817)
Net income | 39,101 |  |  |  | 39,101 |
Unrealized gain on investment securities, net of tax | 222 |  |  | 222 |  |
Issuance of shares pursuant to stock compensation plan | 18,289 |  | (13,742) |  |  | $ 32,031
Issuance of shares pursuant to stock compensation plan, shares |  |  |  |  |  | 1,443
Stock compensation | 11,653 |  | 11,653 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 3,542 |  | 2,034 |  |  | $ 1,508
Issuance of shares pursuant to employee stock purchase plan, shares | 64 |  |  |  |  | 64
Federal income tax benefit related to exercise of stock options | $ 28,213 |  | 28,213 |  |  |
Balance at Dec. 31, 2013 | 246,319 | $ 481 | 182,176 | (46) | 202,210 | $ (138,502)
Balance, shares at Dec. 31, 2013 |  | 48,148 |  |  |  | (15,310)
Net income | 58,940 |  |  |  | 58,940 |
Issuance of shares pursuant to stock compensation plan | 14,680 |  | (17,449) |  |  | $ 32,129
Issuance of shares pursuant to stock compensation plan, shares |  |  |  |  |  | 855
Stock compensation | 14,819 |  | 14,819 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 4,144 |  | 2,235 |  |  | $ 1,909
Issuance of shares pursuant to employee stock purchase plan, shares | 53 |  |  |  |  | 53
Federal income tax benefit related to exercise of stock options | $ 19,415 |  | 19,415 |  |  |
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)
Treasury stock purchases | $ (22,817) |  |  |  |  | $ (22,817)
Treasury stock purchases, shares | (294) |  |  |  |  | (294)
Issuance of shares for acquisitions | $ 1,473 |  | 193 |  |  | $ 1,280
Issuance of shares for acquisitions, shares | 17 |  |  |  |  | 17
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
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 |  |  |
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)
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

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