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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock | Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance | Treasury Stock | Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, Value at Dec. 31, 2017 | $ 2,582,699 | $ 117,515 | $ 2,700,214 | $ 28,689 | $ 28,689 | $ 483,733 | $ 483,733 | $ (386,322) | $ (386,322) | $ 2,456,599 | $ 117,515 | $ 2,574,114
Beginning Balance, Shares at Dec. 31, 2017 |  |  |  | 286,895 | 286,895 |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201409Member |  |  |  |  |  |  |  |  |  |  |
Net income | $ 344,255 |  |  |  |  |  |  |  |  | 344,255 |  |
Net unrealized holding (loss) gain on available-for-sale securities | (78) |  |  |  |  | (21) |  |  |  | (57) |  |
Common stock issued for employee stock benefit plans | 40,167 |  |  | $ 310 |  | 39,857 |  |  |  |  |  |
Common stock issued for employee stock benefit plans, Shares |  |  |  | 3,096 |  |  |  |  |  |  |  |
Common stock issued for agency acquisitions | 100,000 |  |  | $ 338 |  | 99,662 |  |  |  |  |  |
Common stock issued for agency acquisitions, Shares |  |  |  | 3,376 |  |  |  |  |  |  |  |
Purchase of treasury stock | (100,000) |  |  |  |  | (8,750) |  | (91,250) |  |  |  |
Common stock issued to directors | 700 |  |  | $ 1 |  | 699 |  |  |  |  |  |
Common stock issued to directors, Shares |  |  |  | 13 |  |  |  |  |  |  |  |
Cash dividends paid | (84,690) |  |  |  |  |  |  |  |  | (84,690) |  |
Ending Balance, Value at Dec. 31, 2018 | 3,000,568 |  |  | $ 29,338 |  | 615,180 |  | (477,572) |  | 2,833,622 |  |
Ending Balance, Shares at Dec. 31, 2018 |  |  |  | 293,380 |  |  |  |  |  |  |  |
Net income | 398,514 |  |  |  |  |  |  |  |  | 398,514 |  |
Net unrealized holding (loss) gain on available-for-sale securities | 152 |  |  |  |  | 182 |  |  |  | (30) |  |
Common stock issued for employee stock benefit plans | 60,180 |  |  | $ 313 |  | 59,867 |  |  |  |  |  |
Common stock issued for employee stock benefit plans, Shares |  |  |  | 3,129 |  |  |  |  |  |  |  |
Common stock issued for agency acquisitions | 20,000 |  |  | $ 57 |  | 19,943 |  |  |  |  |  |
Common stock issued for agency acquisitions, Shares |  |  |  | 569 |  |  |  |  |  |  |  |
Purchase of treasury stock | (38,671) |  |  |  |  | 20,000 |  | (58,671) |  |  |  |
Common stock issued to directors | 880 |  |  | $ 3 |  | 877 |  |  |  |  |  |
Common stock issued to directors, Shares |  |  |  | 28 |  |  |  |  |  |  |  |
Cash dividends paid | (91,344) |  |  |  |  |  |  |  |  | (91,344) |  |
Ending Balance, Value at Dec. 31, 2019 | $ 3,350,279 |  |  | $ 29,711 |  | 716,049 |  | (536,243) |  | 3,140,762 |  |
Ending Balance, Shares at Dec. 31, 2019 | 281,655 |  |  | 297,106 |  |  |  |  |  |  |  |
Net income | $ 480,483 |  |  |  |  |  |  |  |  | 480,483 |  |
Net unrealized holding (loss) gain on available-for-sale securities | 496 |  |  |  |  | 466 |  |  |  | 30 |  |
Common stock issued for employee stock benefit plans | 47,945 |  |  | $ 184 |  | 47,761 |  |  |  |  |  |
Common stock issued for employee stock benefit plans, Shares |  |  |  | 1,844 |  |  |  |  |  |  |  |
Common stock issued for agency acquisitions | 30,120 |  |  | $ 72 |  | 30,048 |  |  |  |  |  |
Common stock issued for agency acquisitions, Shares |  |  |  | 723 |  |  |  |  |  |  |  |
Purchase of treasury stock | (55,095) |  |  |  |  |  |  | (55,095) |  |  |  |
Common stock issued to directors | 587 |  |  | $ 2 |  | 585 |  |  |  |  |  |
Common stock issued to directors, Shares |  |  |  | 16 |  |  |  |  |  |  |  |
Cash dividends paid | (100,592) |  |  |  |  |  |  |  |  | (100,592) |  |
Ending Balance, Value at Dec. 31, 2020 | $ 3,754,223 |  |  | $ 29,969 |  | $ 794,909 |  | $ (591,338) |  | $ 3,520,683 |  |
Ending Balance, Shares at Dec. 31, 2020 | 283,004 |  |  | 299,689 |  |  |  |  |  |  |  |

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