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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] Cumulative Effect of Adoption Adjustment | Retained Earnings [Member] | Cumulative Effect of Adoption Adjustment | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 527 | $ (125,452) | $ 256,806 | $ (453) |  | $ 1,082,169 |  | $ 1,213,597
Beginning Balance, shares at Dec. 31, 2018 | 52,690 | 4,489 |  |  |  |  |  |
Comprehensive income |  |  |  | $ 453 |  | 259,175 |  | 259,628
Common stock purchased for treasury |  | $ (35,786) |  |  |  |  |  | (35,786)
Common stock purchased for treasury, shares |  | 376 |  |  |  |  |  |
Restricted shares forfeited, shares |  | 16 |  |  |  |  |  |
Share-based compensation | $ 2 | $ (8,127) | 10,298 |  |  |  |  | 2,173
Share-based compensation, shares | 152 | 68 |  |  |  |  |  |
Exercise of stock options | $ 2 |  | 3,819 |  |  |  |  | 3,821
Exercise of stock options, shares | 212 |  |  |  |  |  |  |
Ending Balance (ASU 2016-13) at Dec. 31, 2019 |  |  |  |  | $ (3,832) |  | $ (3,832) |
Ending Balance at Dec. 31, 2019 | $ 531 | $ (169,365) | 270,923 |  |  | 1,341,344 |  | 1,443,433
Ending Balance, shares at Dec. 31, 2019 | 53,054 | 4,949 |  |  |  |  |  |
Comprehensive income |  |  |  |  |  | 257,196 |  | 257,196
Common stock purchased for treasury |  | $ (129,045) |  |  |  |  |  | (129,045)
Common stock purchased for treasury, shares |  | 1,602 |  |  |  |  |  |
Restricted shares forfeited, shares |  | 15 |  |  |  |  |  |
Share-based compensation | $ 1 | $ (4,969) | 10,662 |  |  |  |  | 5,694
Share-based compensation, shares | 167 | 62 |  |  |  |  |  |
Exercise of stock options | $ 1 |  | 882 |  |  |  |  | 883
Exercise of stock options, shares | 56 |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2020 | $ 533 | $ (303,379) | 282,467 |  |  | 1,594,708 |  | 1,574,329
Ending Balance, shares at Dec. 31, 2020 | 53,277 | 6,628 |  |  |  |  |  |
Comprehensive income |  |  |  |  |  | 260,344 |  | 260,344
Common stock purchased for treasury |  | $ (797,838) |  |  |  |  |  | (797,838)
Common stock purchased for treasury, shares |  | 9,199 |  |  |  |  |  |
Restricted shares forfeited, shares |  | 32 |  |  |  |  |  |
Share-based compensation | $ 1 | $ (5,994) | 11,525 |  |  |  |  | 5,532
Share-based compensation, shares | 184 | 56 |  |  |  |  |  |
Exercise of stock options | $ 2 |  | 2,678 |  |  |  |  | 2,680
Exercise of stock options, shares | 176 |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2021 | $ 536 | $ (1,107,211) | $ 296,670 |  |  | $ 1,855,052 |  | $ 1,045,047
Ending Balance, shares at Dec. 31, 2021 | 53,637 | 15,915 |  |  |  |  |  |

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