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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Balance at Jan. 01, 2018 $ 1,953,646 $ 24,444 $ 1,638,413 $ 18,776 $ 272,013
Balance, Shares at Jan. 01, 2018   195,548      
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax (7,979) $ 150 (8,129)    
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   1,199      
Stock-based compensation expense 8,472   8,472    
Repurchase of common stock $ (140,672) $ (368)     (140,304)
Repurchase of common stock (in shares) 2,900 (2,939)      
Cash dividends ($0.09 per share) $ (17,598)       (17,598)
Net income 86,974       86,974
Foreign currency translation adjustment 10,541     10,541  
Unrealized gains (losses) on marketable securities:          
Unrealized gain (loss) on marketable securities, net of tax (2,687)     (2,687)  
Less: reclassification adjustment for gains included in net income, net of tax 1,668     1,668  
Reclassification of unrealized gains on equity securities, net of tax of $(902) 0     (3,125) 3,125
Amortization of prior service benefit, net of tax (61)     (61)  
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $769 0     769 (769)
Balance at Apr. 01, 2018 1,904,983 $ 24,226 1,638,756 25,881 216,120
Balance, Shares at Apr. 01, 2018   193,808      
Unrealized gains (losses) on marketable securities:          
Cumulative effect of changes in accounting principle related to revenue recognition 12,679       12,679
Balance at Dec. 31, 2018 1,522,354 $ 21,940 1,671,645 (13,040) (158,191)
Balance, Shares at Dec. 31, 2018   175,522      
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax (49) $ 161 (210)    
Issuance of common stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   1,287      
Stock-based compensation expense 8,562   8,562    
Repurchase of common stock $ (151,470) $ (557)     (150,913)
Repurchase of common stock (in shares) 4,500 (4,456)      
Cash dividends ($0.09 per share) $ (15,641)       (15,641)
Net income 109,138       109,138
Foreign currency translation adjustment (4,659)     (4,659)  
Unrealized gains (losses) on marketable securities:          
Unrealized gain (loss) on marketable securities, net of tax 2,100     2,100  
Less: reclassification adjustment for gains included in net income, net of tax (70)     (70)  
Amortization of prior service benefit, net of tax (37)     (37)  
Reclassification of tax effects resulting from the Tax Reform Act, net of tax of $769 107     107  
Balance at Mar. 31, 2019 $ 1,470,228 $ 21,544 $ 1,679,997 $ (15,706) $ (215,607)
Balance, Shares at Mar. 31, 2019   172,353