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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 32,820 | $ 71 | $ 4,410 | $ (23) | $ 28,362
Beginning Balance, shares at Dec. 31, 2014 |  | 7,126 |  |  |
Common stock issued on exercise of options and vesting of restricted stock units | 702 | $ 1 | 701 |  |
Common stock issued on exercise of options and vesting of restricted stock units, shares |  | 89 |  |  |
Common stock repurchased on vesting of restricted stock units | (465) |  | (465) |  |
Common stock repurchased on vesting of restricted stock units, shares |  | (12) |  |  |
Share-based compensation expense | 2,386 |  | 2,386 |  |
Excess tax benefits from share-based compensation | (68) |  | (68) |  |
Cash dividends on common stock | (6,310) |  |  |  | (6,310)
Unrealized (losses) gains on investments, net of tax | (8) |  |  | (8) |
Net income | 25,494 |  |  |  | 25,494
Ending Balance at Dec. 31, 2015 | 54,551 | $ 72 | 6,964 | (31) | 47,546
Ending Balance, shares at Dec. 31, 2015 |  | 7,203 |  |  |
Common stock issued on exercise of options and vesting of restricted stock units | 72 |  | 72 |  |
Common stock issued on exercise of options and vesting of restricted stock units, shares |  | 52 |  |  |
Common stock repurchased on vesting of restricted stock units | (433) |  | (433) |  |
Common stock repurchased on vesting of restricted stock units, shares |  | (11) |  |  |
Share-based compensation expense | 2,782 |  | 2,782 |  |
Excess tax benefits from share-based compensation | 253 |  | 253 |  |
Cash dividends on common stock | (6,359) |  |  |  | (6,359)
Unrealized (losses) gains on investments, net of tax | 28 |  |  | 28 |
Net income | 18,799 |  |  |  | 18,799
Ending Balance at Dec. 31, 2016 | 69,693 | $ 72 | 9,638 | (3) | 59,986
Ending Balance, shares at Dec. 31, 2016 |  | 7,244 |  |  |
Common stock issued on exercise of options and vesting of restricted stock units | 163 | $ 1 | 162 |  |
Common stock issued on exercise of options and vesting of restricted stock units, shares |  | 86 |  |  |
Common stock repurchased on vesting of restricted stock units | (1,673) |  | (1,673) |  |
Common stock repurchased on vesting of restricted stock units, shares |  | (29) |  |  |
Share-based compensation expense | 4,184 |  | 4,184 |  |
Cash dividends on common stock | (7,276) |  |  |  | (7,276)
Unrealized (losses) gains on investments, net of tax | (1,427) |  |  | (1,427) |
Net income | 25,170 |  |  |  | 25,170
Ending Balance at Dec. 31, 2017 | $ 88,834 | $ 73 | $ 12,311 | $ (1,430) | $ 77,880
Ending Balance, shares at Dec. 31, 2017 |  | 7,301 |  |  |

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