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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERSEQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income | Cumulative Effect Period of Adoption Adjustment | Cumulative Effect Period of Adoption Adjustment Retained Earnings
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  | 21,743,498 |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 1,425,224 | $ 217 | $ 1,306,653 | $ 118,322 | $ 32 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 9,030 |  | 8,947 | 83 |  |  |
Exercise of stock options, net (in shares) |  | 103,364 |  |  |  |  |
Exercise of stock options, net | (1,772) | $ 2 | (1,774) |  |  |  |
Issuance of restricted stock, net (in shares) |  | 117,643 |  |  |  |  |
Issuance of restricted stock, net | (7,472) | $ 1 | (7,473) |  |  |  |
Common stock dividends | (33,367) |  |  | (33,367) |  |  |
Unrealized (losses) gains on marketable securities, net of tax | 415 |  |  |  | 415 |  |
Net income | 52,601 |  |  | 52,601 |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 21,964,505 |  |  |  |  |
Ending balance at Sep. 30, 2019 | 1,444,659 | $ 220 | 1,306,353 | 137,639 | 447 |  |
Beginning balance (in shares) at Jun. 30, 2019 |  | 21,948,563 |  |  |  |  |
Beginning balance at Jun. 30, 2019 | 1,437,876 | $ 219 | 1,305,148 | 132,060 | 449 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation | 3,021 |  | 3,021 |  |  |  |
Exercise of stock options, net (in shares) |  | 12,795 |  |  |  |  |
Exercise of stock options, net | (1,564) | $ 1 | (1,565) |  |  |  |
Issuance of restricted stock, net (in shares) |  | 3,147 |  |  |  |  |
Issuance of restricted stock, net | (251) |  | (251) |  |  |  |
Common stock dividends | (11,113) |  |  | (11,113) |  |  |
Unrealized (losses) gains on marketable securities, net of tax | (2) |  |  |  | (2) |  |
Net income | 16,692 |  |  | 16,692 |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 21,964,505 |  |  |  |  |
Ending balance at Sep. 30, 2019 | 1,444,659 | $ 220 | 1,306,353 | 137,639 | 447 |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 21,964,809 |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 1,462,710 | $ 220 | 1,309,438 | 152,819 | 233 | $ (3,311) | $ (3,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 2,185,000 |  |  |  |  |
Issuance of common stock in public offering | 220,248 | $ 22 | 220,226 |  |  |  |
Stock-based compensation | 10,759 |  | 10,743 | 16 |  |  |
Exercise of stock options, net (in shares) |  | 19,810 |  |  |  |  |
Exercise of stock options, net | 1,207 |  | 1,207 |  |  |  |
Issuance of restricted stock, net (in shares) |  | 235,514 |  |  |  |  |
Issuance of restricted stock, net | (25,845) | $ 2 | (25,847) |  |  |  |
Repurchase of common stock (in shares) |  | (1,769) |  |  |  |  |
Repurchase of common stock | (247) |  | (105) | (142) |  |  |
Common stock dividends | (41,341) |  |  | (41,341) |  |  |
Unrealized (losses) gains on marketable securities, net of tax | 527 |  |  |  | 527 |  |
Net income | 80,351 |  |  | 80,351 |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 24,403,364 |  |  |  |  |
Ending balance at Sep. 30, 2020 | 1,705,058 | $ 244 | 1,515,662 | 188,392 | 760 |  |
Beginning balance (in shares) at Jun. 30, 2020 |  | 22,222,936 |  |  |  |  |
Beginning balance at Jun. 30, 2020 | 1,484,550 | $ 222 | 1,291,597 | 192,072 | 659 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 2,185,000 |  |  |  |  |
Issuance of common stock in public offering | 220,248 | $ 22 | 220,226 |  |  |  |
Stock-based compensation | 3,875 |  | 3,860 | 15 |  |  |
Exercise of stock options, net (in shares) |  | 243 |  |  |  |  |
Exercise of stock options, net | 21 |  | 21 |  |  |  |
Issuance of restricted stock, net (in shares) |  | (4,815) |  |  |  |  |
Issuance of restricted stock, net | (42) |  | (42) |  |  |  |
Common stock dividends | (14,655) |  |  | (14,655) |  |  |
Unrealized (losses) gains on marketable securities, net of tax | 101 |  |  |  | 101 |  |
Net income | 10,960 |  |  | 10,960 |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 24,403,364 |  |  |  |  |
Ending balance at Sep. 30, 2020 | $ 1,705,058 | $ 244 | $ 1,515,662 | $ 188,392 | $ 760 |  |

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