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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, 2016 | $ 69,693 | $ 72 | $ 9,638 | $ (3) | $ 59,986
Beginning 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/stock awards | (1,673) |  | (1,673) |  |
Common stock repurchased on vesting of restricted stock units/stock awards, shares |  | (29) |  |  |
Share-based compensation expense | 4,184 |  | 4,184 |  |
Cash dividends on common stock | (7,276) |  |  |  | (7,276)
Unrealized gain (loss) 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 |  |  |
Common stock issued on exercise of options and vesting of restricted stock units | 577 | $ 1 | 576 |  |
Common stock issued on exercise of options and vesting of restricted stock units, shares |  | 126 |  |  |
Common stock repurchased on vesting of restricted stock units/stock awards | (2,952) |  | (2,952) |  |
Common stock repurchased on vesting of restricted stock units/stock awards, shares |  | (32) |  |  |
Share-based compensation expense | 5,502 |  | 5,502 |  |
Cash dividends on common stock | (7,348) |  |  |  | (7,348)
Unrealized gain (loss) on investments, net of tax | (3,638) |  |  | (3,638) |
Net income | 38,062 |  |  |  | 38,062
Ending Balance at Dec. 31, 2018 | 119,037 | $ 74 | 15,437 | (5,068) | 108,594
Ending Balance, shares at Dec. 31, 2018 |  | 7,395 |  |  |
Common stock issued on exercise of options and vesting of restricted stock units | 754 | $ 1 | 753 |  |
Common stock issued on exercise of options and vesting of restricted stock units, shares |  | 157 |  |  |
Common stock repurchased on vesting of restricted stock units/stock awards | (3,136) |  | (3,136) |  |
Common stock repurchased on vesting of restricted stock units/stock awards, shares |  | (38) |  |  |
Share-based compensation expense | 7,173 |  | 7,173 |  |
Cash dividends on common stock | (8,208) |  |  |  | (8,208)
Unrealized gain (loss) on investments, net of tax | 7,887 |  |  | 7,887 |
Net income | 48,292 |  |  |  | 48,292
Ending Balance at Dec. 31, 2019 | $ 171,799 | $ 75 | $ 20,227 | $ 2,819 | $ 148,678
Ending Balance, shares at Dec. 31, 2019 |  | 7,514 |  |  |

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