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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Preferred Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2013 |  | $ 175,609 | $ 436 |  | $ 42,282 | $ 168,734 | $ (376) | $ (35,467)
Beginning balance, shares at Dec. 31, 2013 |  |  | 43,641 | 30 |  |  |  |
Stock option exercises |  | (6,036) | $ 19 |  | 9,347 |  |  | (15,402)
Stock option exercises, shares |  |  | 1,900 |  |  |  |  |
Grants and vesting of restricted stock |  | (11,545) | $ 10 |  | (10) |  |  | (11,545)
Grants and vesting of restricted stock, shares |  |  | 950 |  |  |  |  |
Conversion of preferred stock |  |  | $ 1 |  | (1) |  |  |
Conversion of preferred stock, shares |  |  | 65 | (18) |  |  |  |
Purchases of treasury stock |  | (29,736) |  |  |  |  |  | $ (29,736)
Purchases of treasury stock, shares |  |  |  |  |  |  |  | 2,392
Treasury shares reissued |  |  |  |  | (3,050) |  |  | $ 3,050
Retirement of treasury shares |  |  | $ (18) |  | (26,929) |  |  | $ 26,947
Retirement of treasury shares, shares |  |  | (1,787) |  |  |  |  | 1,787
Share-based compensation |  | 12,342 |  |  | 12,342 |  |  |
Net income |  | 72,988 |  |  |  | 72,988 |  |
Change in net unrealized gains (losses) | [1] | (1,459) |  |  |  |  | (1,459) |
Excess tax benefit (shortfall), net | [2] | 7,006 |  |  | 7,006 |  |  |
Declaration of dividends |  | (19,253) |  |  |  | (19,253) |  |
Ending Balance at Dec. 31, 2014 |  | 199,916 | $ 448 |  | 40,987 | 222,469 | (1,835) | $ (62,153)
Ending balance, shares at Dec. 31, 2014 |  |  | 44,769 | 12 |  |  |  |
Stock option exercises |  | (4,287) | $ 7 |  | 3,807 |  |  | (8,101)
Stock option exercises, shares |  |  | 751 |  |  |  |  |
Grants and vesting of restricted stock |  | (7,344) | $ 6 |  | (6) |  |  | (7,344)
Grants and vesting of restricted stock, shares |  |  | 615 |  |  |  |  |
Purchase of preferred stock |  | (256) |  |  | (256) |  |  |
Purchase of preferred stock, shares |  |  |  | (2) |  |  |  |
Purchases of treasury stock |  | (18,649) |  |  |  |  |  | $ (18,649)
Purchases of treasury stock, shares |  |  |  |  |  |  |  | 748
Reclassification of contingently redeemable common stock to common stock |  | 19,000 |  |  | 19,000 |  |  |
Retirement of treasury shares |  |  | $ (6) |  | (15,439) |  |  | $ 15,445
Retirement of treasury shares, shares |  |  | (610) |  |  |  |  | 610
Share-based compensation |  | 17,386 |  |  | 17,386 |  |  |
Net income |  | 106,484 |  |  |  | 106,484 |  |
Change in net unrealized gains (losses) | [1] | (2,171) |  |  |  |  | (2,171) |
Excess tax benefit (shortfall), net | [2] | 5,310 |  |  | 5,310 |  |  |
Declaration of dividends |  | (22,297) |  |  |  | (22,297) |  |
Ending Balance at Dec. 31, 2015 |  | 293,092 | $ 455 |  | 70,789 | 306,656 | (4,006) | $ (80,802)
Ending balance, shares at Dec. 31, 2015 |  |  | 45,525 | 10 |  |  |  |
Stock option exercises |  | $ (5,332) | $ 1 |  | 905 |  |  | (6,238)
Stock option exercises, shares |  | 124 | 124 |  |  |  |  |
Purchases of treasury stock |  | $ (8,510) |  |  |  |  |  | $ (8,510)
Purchases of treasury stock, shares |  |  |  |  |  |  |  | 441
Treasury shares reissued |  | 10,000 |  |  | 7,670 |  |  | $ 2,330
Retirement of treasury shares |  |  | $ (3) |  | (6,235) |  |  | $ 6,238
Retirement of treasury shares, shares |  |  | (325) |  |  |  |  | 325
Share-based compensation |  | 10,288 |  |  | 10,288 |  |  |
Net income |  | 99,410 |  |  |  | 99,410 |  |
Change in net unrealized gains (losses) | [1] | (2,402) |  |  |  |  | (2,402) |
Excess tax benefit (shortfall), net | [2] | (1,154) |  |  | (1,154) |  |  |
Declaration of dividends |  | (24,202) |  |  |  | (24,202) |  |
Ending Balance at Dec. 31, 2016 |  | $ 371,190 | $ 453 |  | $ 82,263 | $ 381,864 | $ (6,408) | $ (86,982)
Ending balance, shares at Dec. 31, 2016 |  |  | 45,324 | 10 |  |  |  |
[1] | Represents change in fair value of available for sale investments, net of tax benefit of $1,486 thousand, $1,369 thousand and $916 thousand in years ended December 31, 2016, 2015 and 2014, respectively.
[2] | Excess tax benefit (shortfall) relate to share-based compensation.

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