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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Convertible Common Shares
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive (Loss) Income
Retained Earnings (Accumulated Deficit)
Retained Earnings (Accumulated Deficit)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2017 $ 1,953,646     $ 24,444 $ 1,638,413 $ 18,776 $ 272,013  
Balance, Shares at Dec. 31, 2017       195,548        
Net issuance of common stock under stock-based plans 129     $ 201 (72)      
Net issuance of common stock under stock-based plans (in shares)       1,613        
Stock-based compensation expense 33,304       33,304      
Repurchase of common stock (832,356)     $ (2,705)     (829,651)  
Repurchase of common stock (in shares)       (21,639)        
Cash dividends (67,367)           (67,367)  
Net income 451,779           451,779  
Other comprehensive income (29,460)         (29,460)    
Reclassification of unrealized gains on equity securities           (3,125) 3,125  
Reclassification of tax effects resulting from the Tax Reform Act           769 (769)  
Balance at Dec. 31, 2018 1,522,354   $ 12,679 $ 21,940 1,671,645 (13,040) (158,191) $ 12,679
Balance, Shares at Dec. 31, 2018       175,522        
Net issuance of common stock under stock-based plans 10,622     $ 223 10,399      
Net issuance of common stock under stock-based plans (in shares)       1,784        
Stock-based compensation expense 38,085       38,085      
Repurchase of common stock (491,202)     $ (1,362)     (489,840)  
Repurchase of common stock (in shares)       (10,896)        
Cash dividends (61,355)           (61,355)  
Net income 467,468           467,468  
Other comprehensive income (5,814)         (5,814)    
Balance at Dec. 31, 2019 1,480,158     $ 20,801 1,720,129 (18,854) (241,918)  
Balance, Shares at Dec. 31, 2019       166,410        
Net issuance of common stock under stock-based plans       $ 154 4,696 4,850    
Net issuance of common stock under stock-based plans (in shares)       1,230        
Stock-based compensation expense 44,285       44,285      
Repurchase of common stock (88,465)     $ (190)     (88,275)  
Repurchase of common stock (in shares)       (1,517)        
Cash dividends (66,540)           (66,540)  
Convertible common shares (3,787)       (3,787)      
Convertible common shares (in shares)   3,787            
Net income 784,147           784,147  
Other comprehensive income 52,370         52,370    
Balance at Dec. 31, 2020 $ 2,207,018     $ 20,765 $ 1,765,323 $ 33,516 $ 387,414  
Balance, Shares at Dec. 31, 2020   3,787   166,123