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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common stock | Additional paid-in capital | Treasury stock | Retained earnings | Retained earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 47,854,510 |  | 0 |  |  |
Beginning balance at Dec. 31, 2017 | $ 1,020,305 | $ 1,599 | $ 479 | $ 325,854 | $ 0 | $ 723,062 | $ 1,599 | $ (29,090)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 128,687 |  |  |  |  | 128,687 |  |
Other comprehensive income, net of tax | (16,889) |  |  |  |  |  |  | (16,889)
Dividends | $ (82,573) |  |  |  |  | (82,573) |  |
Exercise of stock options (in shares) | 67,898 |  | 67,898 |  |  |  |  |
Exercise of stock options | $ 1,540 |  | $ 1 | 1,539 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan (in shares) |  |  | 33,262 |  |  |  |  |
Issuance of shares under Employee Stock Purchase Plan | 2,084 |  |  | 2,084 |  |  |  |
Vested restricted stock (in shares) |  |  | 169,512 |  |  |  |  |
Vested restricted stock | 0 |  | $ 2 | (2) |  |  |  |
Repurchase and retirement of common stock (in shares) |  |  | (52,912) |  | (600,000) |  |  |
Repurchase and retirement of common stock | (47,102) |  | $ (1) | (3,230) | $ (42,543) | (1,328) |  |
Exchange of Series B preferred stock (in shares) |  |  | 10,530 |  |  |  |  |
Exchange of Series B preferred stock | 0 |  |  |  |  |  |  |
Share based compensation | 28,093 |  |  | 27,965 |  | 128 |  |
Ending balance at Dec. 31, 2018 | 1,035,744 |  | $ 481 | 354,210 | $ (42,543) | 769,575 |  | (45,979)
Ending balance (in shares) at Dec. 31, 2018 |  |  | 48,082,800 |  | (600,000) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 218,806 |  |  |  |  | 218,806 |  |
Other comprehensive income, net of tax | (483) |  |  |  |  |  |  | (483)
Dividends | $ (43,918) |  |  |  |  | (43,918) |  |
Exercise of stock options (in shares) | 189,436 |  | 189,436 |  |  |  |  |
Exercise of stock options | $ 5,274 |  | $ 2 | 5,272 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan (in shares) |  |  | 66,413 |  |  |  |  |
Issuance of shares under Employee Stock Purchase Plan | 4,512 |  | $ 1 | 4,511 |  |  |  |
Equity portion of convertible debt | 88,138 |  |  | 88,138 |  |  |  |
Vested restricted stock (in shares) |  |  | 185,227 |  |  |  |  |
Vested restricted stock | 0 |  | $ 1 | (1) |  |  |  |
Repurchase and retirement of common stock (in shares) |  |  | (868,947) |  | 600,000 |  |  |
Repurchase and retirement of common stock | (20,803) |  | $ (9) | (10,334) | $ 42,543 | (53,003) |  |
Share based compensation | 23,922 |  |  | 23,856 |  | 66 |  |
Ending balance at Dec. 31, 2019 | 1,311,192 |  | $ 476 | 465,652 | $ 0 | 891,526 |  | (46,462)
Ending balance (in shares) at Dec. 31, 2019 |  |  | 47,654,929 |  | 0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 150,668 |  |  |  |  | 150,668 |  |
Other comprehensive income, net of tax | $ (8,344) |  |  |  |  |  |  | (8,344)
Exercise of stock options (in shares) | 42,740 |  | 42,740 |  |  |  |  |
Exercise of stock options | $ 1,619 |  |  | 1,619 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan (in shares) |  |  | 118,629 |  |  |  |  |
Issuance of shares under Employee Stock Purchase Plan | 7,382 |  | $ 1 | 7,381 |  |  |  |
Exercise of 3.25% Convertible Note | (12) |  |  | (12) |  |  |  |
Vested restricted stock (in shares) |  |  | 273,201 |  |  |  |  |
Vested restricted stock | 0 |  | $ 3 | (3) |  |  |  |
Repurchase and retirement of common stock (in shares) |  |  | (3,742,869) |  |  |  |  |
Repurchase and retirement of common stock | (275,654) |  | $ (37) | (42,530) |  | (233,087) |  |
Share based compensation | 24,006 |  |  | 24,006 |  |  |  |
Other, net | 161 |  |  | 161 |  |  |  |
Ending balance at Dec. 31, 2020 | $ 1,211,018 |  | $ 443 | $ 456,274 | $ 0 | $ 809,107 |  | $ (54,806)
Ending balance (in shares) at Dec. 31, 2020 |  |  | 44,346,630 |  | 0 |  |  |

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