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Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss), net of taxes | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 |  |  |  |  | $ (319) |
Comprehensive income: |  |  |  |  |  |
Net income for the period | $ 68,040 |  |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 1,163 |  |  |  |  |
Total comprehensive income | 69,203 |  |  |  |  |
Ending balance at Sep. 30, 2017 |  |  |  |  | 844 |
Balance (in shares) at Dec. 31, 2017 |  | 74,960 |  |  |  |
Beginning balance at Dec. 31, 2017 | 399,952 | $ 750 | $ 244,363 | $ 163,860 | 837 | $ (9,858)
Comprehensive income: |  |  |  |  |  |
Net income for the period | 51,972 |  |  | 51,972 |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | (1,549) |  |  |  | (1,549) |
Total comprehensive income | 50,423 |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  | 292 |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment | 6,554 | $ 3 | 6,551 |  |  |
Share-based compensation expense — stock options, restricted stock | 4,174 |  | 4,174 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 475 |  | 597 |  |  | (122)
Shares issued pursuant to Employee Stock Plan | 2,819 |  | 2,473 |  |  | 346
Dividends paid and accrued | (42,868) |  |  | (42,868) |  |
Shares issued pursuant to Dividend Reinvestment Plan | 68 |  | 57 |  |  | 11
Contingent shares settled pursuant to acquisition | (2,291) |  | (2,291) |  |  |
Other (in shares) |  | 4 |  |  |  |
Other | 274 |  | 205 | 69 |  |
Balance (in shares) at Sep. 30, 2018 |  | 75,256 |  |  |  |
Ending balance at Sep. 30, 2018 | $ 419,580 | $ 753 | $ 256,129 | $ 173,033 | $ (712) | $ (9,623)

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