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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common stock | Preferred Shares Issued | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 |  | $ 293,092 | $ 455 |  | $ 70,789 | $ 306,656 | $ (4,006) | $ (80,802)
Beginning balance, shares (in shares) at Dec. 31, 2015 |  |  | 45,525 | 10 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock option exercises |  | $ (5,332) | $ 1 |  | 905 |  |  | (6,238)
Stock option exercises, shares (in shares) |  | 124 | 124 |  |  |  |  |
Purchases of treasury stock |  | $ (8,510) |  |  |  |  |  | (8,510)
Treasury shares reissued |  | 10,000 |  |  | 7,670 |  |  | 2,330
Retirement of treasury shares |  | $ 0 | $ (3) |  | (6,235) |  |  | 6,238
Retirement of treasury shares, shares (in shares) |  | (325) | (325) |  |  |  |  |
Share-based compensation |  | $ 10,288 |  |  | 10,288 |  |  |
Net income |  | 99,410 |  |  |  | 99,410 |  |
Other comprehensive income (loss) | [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 (in shares) at Dec. 31, 2016 |  |  | 45,324 | 10 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Tax expense (benefit) from AFS securities adjustment |  | (1,486) |  |  |  |  |  |
Vesting of performance share units |  | $ (1,183) | $ 1 |  | (1) |  |  | (1,183)
Vesting of performance share units, shares (in shares) |  | 115 | 115 |  |  |  |  |
Stock option exercises |  | $ (6,039) | $ 8 |  | 5,578 |  |  | (11,625)
Stock option exercises, shares (in shares) |  | 804 | 804 |  |  |  |  |
Common stock issued |  | $ 635 | $ 1 |  | 634 |  |  |
Common stock issued, shares (in shares) |  | 26 | 26 |  |  |  |  |
Purchases of treasury stock |  | $ (18,141) |  |  |  |  |  | (18,141)
Retirement of treasury shares |  | $ 0 | $ (5) |  | (12,803) |  |  | 12,808
Retirement of treasury shares, shares (in shares) |  | (491) | (491) |  |  |  |  |
Share-based compensation |  | $ 10,515 |  |  | 10,515 |  |  |
Net income |  | 106,935 |  |  |  | 106,935 |  |
Other comprehensive income (loss) | [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 (in shares) at Dec. 31, 2017 |  |  | 45,778 | 10 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Tax expense (benefit) from AFS securities adjustment |  | 76 |  |  |  |  |  |
Vesting of performance share units |  | $ (1,273) | $ 1 |  | (1) |  |  | (1,273)
Vesting of performance share units, shares (in shares) |  | 127 | 127 |  |  |  |  |
Stock option exercises |  | $ (11,185) | $ 19 |  | 36,568 |  |  | (47,772)
Stock option exercises, shares (in shares) |  | 1,890 | 1,890 |  |  |  |  |
Grants and vesting of restricted stock |  | $ (154) | $ 1 |  | (1) |  |  | (154)
Grants and vesting of restricted stock, shares (in shares) |  |  | 80 |  |  |  |  |
Common stock issued, shares (in shares) |  | 80 |  |  |  |  |  |
Purchases of treasury stock |  | $ (25,276) |  |  |  |  |  | (25,276)
Retirement of treasury shares |  | $ 0 | $ (14) |  | (49,185) |  |  | 49,199
Retirement of treasury shares, shares (in shares) |  | (1,361) | (1,361) |  |  |  |  |
Share-based compensation |  | $ 12,786 |  |  | 12,786 |  |  |
Net income |  | 117,051 |  |  |  | 117,051 |  |
Other comprehensive income (loss) | [1] | (4,748) |  |  |  |  | (4,748) |
Reclassification of income taxes upon adoption of ASU 2018-02 |  |  |  |  |  | 582 | (582) |
Declaration of dividends |  | (25,556) |  |  |  | (25,556) |  |
Ending balance at Dec. 31, 2018 |  | 501,633 | $ 465 |  | $ 86,353 | $ 553,224 | $ (8,010) | $ (130,399)
Ending balance, shares (in shares) at Dec. 31, 2018 |  |  | 46,514 | 10 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Tax expense (benefit) from AFS securities adjustment |  | $ (1,560) |  |  |  |  |  |
[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 $1,560 thousand and $1,486 thousand for the years ended December 31, 2018 and 2016, respectively.
[2] | Excess tax benefit (shortfall), net for the year ended December 31, 2016 were recognized in additional paid-in capital. For the years ended December 31, 2018 and 2017 excess tax benefit (shortfall) were recognized in income tax expense in the consolidated statements of income when the share-based awards vest or are settled. See “—Note 9 (Share-Based Compensation).”

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