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Condensed 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, 2018 | $ 119,037 | $ 74 | $ 15,437 | $ (5,068) | $ 108,594
Beginning Balance, shares at Dec. 31, 2018 |  | 7,395 |  |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards | 122 |  | 122 |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares |  | 17 |  |  |
Common stock repurchased on vesting of restricted stock units and performance awards | (178) |  | (178) |  |
Common stock repurchased on vesting of restricted stock units and performance awards, shares |  | (2) |  |  |
Share-based compensation expense | 1,387 |  | 1,387 |  |
Cash dividends on common stock | (1,852) |  |  |  | (1,852)
Unrealized gain (loss) on investments, net of tax | 3,657 |  |  | 3,657 |
Net (loss) income | (2,300) |  |  |  | (2,300)
Ending Balance at Mar. 31, 2019 | 119,873 | $ 74 | 16,768 | (1,411) | 104,442
Ending Balance, shares at Mar. 31, 2019 |  | 7,410 |  |  |
Beginning Balance at Dec. 31, 2018 | 119,037 | $ 74 | 15,437 | (5,068) | 108,594
Beginning Balance, shares at Dec. 31, 2018 |  | 7,395 |  |  |
Unrealized gain (loss) on investments, net of tax | 6,700 |  |  |  |
Net (loss) income | 11,607 |  |  |  |
Ending Balance at Jun. 30, 2019 | 137,467 | $ 74 | 19,265 | 1,632 | 116,496
Ending Balance, shares at Jun. 30, 2019 |  | 7,414 |  |  |
Beginning Balance at Mar. 31, 2019 | 119,873 | $ 74 | 16,768 | (1,411) | 104,442
Beginning Balance, shares at Mar. 31, 2019 |  | 7,410 |  |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards | 56 |  | 56 |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares |  | 4 |  |  |
Share-based compensation expense | 2,441 |  | 2,441 |  |
Cash dividends on common stock | (1,853) |  |  |  | (1,853)
Unrealized gain (loss) on investments, net of tax | 3,043 |  |  | 3,043 |
Net (loss) income | 13,907 |  |  |  | 13,907
Ending Balance at Jun. 30, 2019 | 137,467 | $ 74 | 19,265 | 1,632 | 116,496
Ending Balance, shares at Jun. 30, 2019 |  | 7,414 |  |  |
Beginning Balance at Dec. 31, 2019 | 171,799 | $ 75 | 20,227 | 2,819 | 148,678
Beginning Balance, shares at Dec. 31, 2019 |  | 7,514 |  |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards | 904 | $ 1 | 903 |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares |  | 56 |  |  |
Common stock repurchased on vesting of restricted stock units and performance awards | (378) |  | (378) |  |
Common stock repurchased on vesting of restricted stock units and performance awards, shares |  | (6) |  |  |
Share-based compensation expense | 342 |  | 342 |  |
Company repurchase of common stock | (2,987) | $ (1) | (169) |  | (2,817)
Company repurchase of common stock, shares |  | (59) |  |  |
Cash dividends on common stock | (2,262) |  |  |  | (2,262)
Unrealized gain (loss) on investments, net of tax | (2,735) |  |  | (2,735) |
Net (loss) income | (3,407) |  |  |  | (3,407)
Ending Balance at Mar. 31, 2020 | 161,276 | $ 75 | 20,925 | 84 | 140,192
Ending Balance, shares at Mar. 31, 2020 |  | 7,505 |  |  |
Beginning Balance at Dec. 31, 2019 | 171,799 | $ 75 | 20,227 | 2,819 | 148,678
Beginning Balance, shares at Dec. 31, 2019 |  | 7,514 |  |  |
Unrealized gain (loss) on investments, net of tax | 4,142 |  |  |  |
Net (loss) income | 8,103 |  |  |  |
Ending Balance at Jun. 30, 2020 | 179,888 | $ 76 | 23,421 | 6,961 | 149,430
Ending Balance, shares at Jun. 30, 2020 |  | 7,598 |  |  |
Beginning Balance at Mar. 31, 2020 | 161,276 | $ 75 | 20,925 | 84 | 140,192
Beginning Balance, shares at Mar. 31, 2020 |  | 7,505 |  |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards | 1,810 | $ 1 | 1,809 |  |
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares |  | 96 |  |  |
Common stock repurchased on vesting of restricted stock units and performance awards | (110) |  | (110) |  |
Common stock repurchased on vesting of restricted stock units and performance awards, shares |  | (3) |  |  |
Share-based compensation expense | 797 |  | 797 |  |
Cash dividends on common stock | (2,272) |  |  |  | (2,272)
Unrealized gain (loss) on investments, net of tax | 6,877 |  |  | 6,877 |
Net (loss) income | 11,510 |  |  |  | 11,510
Ending Balance at Jun. 30, 2020 | $ 179,888 | $ 76 | $ 23,421 | $ 6,961 | $ 149,430
Ending Balance, shares at Jun. 30, 2020 |  | 7,598 |  |  |

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