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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, 2014 |  | $ 199,916 | $ 448 |  | $ 40,987 | $ 222,469 | $ (1,835) | $ (62,153)
Beginning balance, shares at Dec. 31, 2014 |  |  | 44,769 | 12 |  |  |  |
Stock option exercises |  | $ (4,287) | $ 7 |  | 3,807 |  |  | (8,101)
Stock option exercises, shares |  | 751 | 751 |  |  |  |  |
Grants and vesting of restricted stock |  | $ (7,344) | $ 6 |  | (6) |  |  | (7,344)
Grants and vesting of restricted stock, shares |  | 615 | 615 |  |  |  |  |
Purchase of preferred stock |  | $ (256) |  |  | (256) |  |  |
Purchase of preferred stock, shares |  |  |  | (2) |  |  |  |
Purchases of treasury stock |  | (18,649) |  |  |  |  |  | (18,649)
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)
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 |  |  |  |
Vesting of performance share units |  | $ (1,183) | $ 1 |  | (1) |  |  | (1,183)
Vesting of performance share units, shares |  | 115 | 115 |  |  |  |  |
Stock option exercises |  | $ (6,039) | $ 8 |  | 5,578 |  |  | (11,625)
Stock option exercises, shares |  | 804 | 804 |  |  |  |  |
Common stock issued |  | $ 635 | $ 1 |  | 634 |  |  |
Common stock issued, shares |  | 26 | 26 |  |  |  |  |
Purchases of treasury stock |  | $ (18,141) |  |  |  |  |  | (18,141)
Retirement of treasury shares |  |  | $ (5) |  | (12,803) |  |  | 12,808
Retirement of treasury shares, shares |  | (491) | (491) |  |  |  |  |
Share-based compensation |  | $ 10,515 |  |  | 10,515 |  |  |
Net income |  | 106,935 |  |  |  | 106,935 |  |
Change in net unrealized gains (losses) | [1] | 127 |  |  |  |  | 127 |
Declaration of dividends |  | (24,051) |  |  |  | (24,051) |  |
Ending Balance at Dec. 31, 2017 |  | $ 439,988 | $ 458 |  | $ 86,186 | $ 464,748 | $ (6,281) | $ (105,123)
Ending balance, shares at Dec. 31, 2017 |  |  | 45,778 | 10 |  |  |  |
[1] | Represents change in fair value of available for sale investments, net of income tax provision of $76 thousand for the year ended December 31, 2017 and a change in fair value of available for sale investments, net of income tax benefit of $1,486 thousand and $1,369 thousand for the years ended December 31, 2016 and 2015, respectively.
[2] | Excess tax benefits (shortfall), net for the years ended December 31, 2016 and 2015 were recognized in additional paid-in capital. For the year ended December 31, 2017 excess tax benefits (shortfall) were recognized in income tax expense in the consolidated statements of income when the share-based awards vest or are settled. See “—Note 2 (Summary of Significant Accounting Policies – Recently Adopted Accounting Pronouncements).”

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