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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income, net of taxes | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  | 74,960,000 |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 399,952 | $ 750 | $ 244,363 | $ 837 | $ 163,860 | $ (9,858)
Comprehensive income: |  |  |  |  |  |
Net income for the period | 72 |  |  |  | 72 |
Unrealized gain on available-for-sale marketable securities, net of taxes | (1,138) |  |  | (1,138) |  |
Comprehensive income for the period | (1,066) |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  | 205,000 |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment | 5,005 | $ 2 | 5,003 |  |  |
Payment of statutory withholding on issuance of restricted stock and restricted stock units | 295 |  | 295 |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 1,408 |  | 1,408 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 480 |  | 514 |  |  | (34)
Shares issued pursuant to Employee Stock Plan | 2,820 |  | 2,474 |  |  | 346
Dividends paid and accrued | (14,189) |  |  |  | (14,189) |
Shares issued pursuant to Dividend Reinvestment Plan | 24 |  | 20 |  |  | 4
Other (in shares) |  | 4,000 |  |  |  |
Other | 205 |  | 205 |  |  |
Balance (in shares) at Mar. 31, 2018 |  | 75,169,000 |  |  |  |
Ending balance at Mar. 31, 2018 | 394,344 | $ 752 | 253,692 | (301) | 149,743 | (9,542)
Balance (in shares) at Dec. 31, 2018 |  | 75,344,000 |  |  |  |
Beginning balance at Dec. 31, 2018 | 440,780 | $ 753 | 259,440 | 158 | 190,092 | (9,663)
Comprehensive income: |  |  |  |  |  |
Net income for the period | 9,156 |  |  |  | 9,156 |
Unrealized gain on available-for-sale marketable securities, net of taxes | 1,416 |  |  | 1,416 |  |
Comprehensive income for the period | 10,572 |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  | 115,000 |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment | 1,913 | $ 2 | 1,911 |  |  |
Payment of statutory withholding on issuance of restricted stock and restricted stock units | 579 |  | 579 |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 1,656 |  | 1,656 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 536 |  | 535 |  |  | 1
Shares issued pursuant to Employee Stock Plan | 2,130 |  | 1,781 |  |  | 349
Dividends paid and accrued | (14,656) |  |  |  | (14,656) |
Shares issued pursuant to Dividend Reinvestment Plan | 23 |  | 18 |  |  | 5
Other (in shares) |  | 6,000 |  |  |  |
Other | 174 |  | 174 |  |  |
Balance (in shares) at Mar. 31, 2019 |  | 75,465,000 |  |  |  |
Ending balance at Mar. 31, 2019 | $ 442,549 | $ 755 | $ 264,936 | $ 1,574 | $ 184,592 | $ (9,308)

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