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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2013 $ 535,605 $ 656 $ 360,616 $ 155,572 $ 18,761
Beginning Balance (in shares) at Dec. 31, 2013   65,623      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Employee stock compensation 63,183 $ 3 63,180    
Deferred compensation (5,107)   (3,020) (2,087)  
Employee stock compensation (in shares)   254      
Proceeds from stock issuances under employee plans 31,313 $ 10 31,303    
Proceeds from stock issuances under employee plans (in shares)   984      
Tax effect of exercise of stock options 36,966   36,966    
Cash dividends declared ($2.20 per share, $2.12 per share and $1.92 per share in 2016, 2015, and 2014 respectively) (126,908)     (126,908)  
Repurchase and retirement of common shares $ (81,812) $ (6) (3,040) (78,766)  
Repurchase and retirement of common shares (in shares) (554) (554)      
Net income $ 454,029     454,029  
Other comprehensive income (46,002)       (46,002)
Ending Balance at Dec. 31, 2014 861,267 $ 663 486,005 401,840 (27,241)
Ending Balance (in shares) at Dec. 31, 2014   66,307      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Employee stock compensation 61,929 $ 2 61,927    
Deferred compensation 3,883   (2,994) 6,877  
Employee stock compensation (in shares)   144      
Proceeds from stock issuances under employee plans 32,535 $ 10 32,525    
Proceeds from stock issuances under employee plans (in shares)   1,037      
Tax effect of exercise of stock options 34,654   34,654    
Cash dividends declared ($2.20 per share, $2.12 per share and $1.92 per share in 2016, 2015, and 2014 respectively) (139,285)     (139,285)  
Repurchase and retirement of common shares $ (293,616) $ (22) (15,974) (277,620)  
Repurchase and retirement of common shares (in shares) (2,179) (2,179)      
Net income $ 455,361     455,361  
Other comprehensive income (35,251)       (35,251)
Ending Balance at Dec. 31, 2015 981,477 $ 653 596,143 447,173 (62,492)
Ending Balance (in shares) at Dec. 31, 2015   65,309      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Employee stock compensation 57,927 $ 3 57,924    
Deferred compensation 917   1,379 (462)  
Employee stock compensation (in shares)   303      
Proceeds from stock issuances under employee plans 17,690 $ 4 17,686    
Proceeds from stock issuances under employee plans (in shares)   405      
Tax effect of exercise of stock options 3,578   3,578    
Cash dividends declared ($2.20 per share, $2.12 per share and $1.92 per share in 2016, 2015, and 2014 respectively) (140,336)     (140,336)  
Repurchase and retirement of common shares $ (245,816) $ (29) (26,548) (219,239)  
Repurchase and retirement of common shares (in shares) (2,908) (2,908)      
Net income $ 212,948     212,948  
Other comprehensive income (21,345)       (21,345)
Ending Balance at Dec. 31, 2016 $ 867,040 $ 631 $ 650,162 $ 300,084 $ (83,837)
Ending Balance (in shares) at Dec. 31, 2016   63,109