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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained Earnings
Beginning Balance, Value at Dec. 31, 2016 $ 2,360,211 $ 28,547 $ 454,707 $ (257,683) $ 2,134,640
Beginning Balance, Shares at Dec. 31, 2016   285,461      
Net income 399,630       399,630
Net unrealized holding (loss) gain on available-for-sale securities (6)   (47)   41
Common stock issued for employee stock benefit plans 39,965 $ 140 39,825    
Common stock issued for employee stock benefit plans, Shares   1,412      
Purchase of treasury stock (139,889)   (11,250) (128,639)  
Common stock issued to directors 500 $ 2 498    
Common stock issued to directors, Shares   22      
Cash dividends paid (77,712)       (77,712)
Ending Balance, Value at Dec. 31, 2017 2,582,699 $ 28,689 483,733 (386,322) 2,456,599
Ending Balance, Shares at Dec. 31, 2017   286,895      
Adoption of Topic 606 at January 1, 2018 at Dec. 31, 2017 117,515       117,515
Beginning Balance, Value at Dec. 31, 2017 2,700,214 $ 28,689 483,733 (386,322) 2,574,114
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 279,583 293,380      
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