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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERSEQUITY - USD ($) $ in Thousands | Total | Cumulative Effect Period of Adoption Adjustment | Common Stock | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative Effect Period of Adoption Adjustment | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 1,425,224 |  | $ 217 | $ 1,306,653 | $ 118,322 |  | $ 32
Beginning balance, shares at Dec. 31, 2018 |  |  | 21,743,498 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 2,854 |  |  | 2,772 | 82 |  |
Exercise of stock options, net (in shares) |  |  | 51,889 |  |  |  |
Exercise of stock options, net | (1,699) |  | $ 1 | (1,700) |  |  |
Issuance of restricted stock, net (in shares) |  |  | 128,413 |  |  |  |
Issuance of restricted stock, net | (3,554) |  | $ 1 | (3,555) |  |  |
Common stock dividends | (11,121) |  |  |  | (11,121) |  |
Unrealized gains on marketable securities, net of tax | 234 |  |  |  |  |  | 234
Net income | 11,500 |  |  |  | 11,500 |  |
Ending balance, shares at Mar. 31, 2019 |  |  | 21,923,800 |  |  |  |
Ending balance at Mar. 31, 2019 | 1,423,438 |  | $ 219 | 1,304,170 | 118,783 |  | 266
Beginning balance at Dec. 31, 2019 | 1,462,710 |  | $ 220 | 1,309,438 | 152,819 |  | 233
Beginning balance, shares at Dec. 31, 2019 |  |  | 21,964,809 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 3,025 |  |  | 3,025 |  |  |
Exercise of stock options, net (in shares) |  |  | 14,315 |  |  |  |
Exercise of stock options, net | 847 |  | $ 0 | 847 |  |  |
Issuance of restricted stock, net (in shares) |  |  | 236,232 |  |  |  |
Issuance of restricted stock, net | (25,797) |  | $ 2 | (25,799) |  |  |
Repurchase of common stock (in shares) |  |  | (1,769) |  |  |  |
Repurchase of common stock | (247) |  |  | (105) | (142) |  |
Common stock dividends | (13,339) |  |  |  | (13,339) |  |
Unrealized gains on marketable securities, net of tax | 20 |  |  |  |  |  | 20
Net income | 35,239 |  |  |  | 35,239 |  |
Ending balance, shares at Mar. 31, 2020 |  |  | 22,213,587 |  |  |  |
Ending balance at Mar. 31, 2020 | $ 1,459,147 | $ (3,311) | $ 222 | $ 1,287,406 | $ 171,266 | $ (3,311) | $ 253

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