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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2018   38,147      
Beginning Balance at Dec. 31, 2018 $ 1,348,825 $ 381 $ 299,534 $ 1,196,727 $ (147,817)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 62,645     62,645  
Other comprehensive income:          
Cumulative translation adjustment 5,223       5,223
Issuance of common stock in connection with:          
Exercise of options (in shares)   55      
Exercise of options 2,212 $ 1 2,211    
Restricted share grants, less net settled shares (in shares)   153      
Restricted share grants, less net settled shares (2,739) $ 1 (2,740)    
Stock units issued under incentive compensation plan 1,346   1,346    
Purchase and retirement of common stock (in shares)   (328)      
Purchase and retirement of common stock (21,883) $ (3) (21,880)    
Share-based compensation 6,393   6,393    
Ending Balance (in shares) at Mar. 31, 2019   38,027      
Ending Balance at Mar. 31, 2019 1,402,022 $ 380 284,864 1,259,372 (142,594)
Beginning Balance (in shares) at Dec. 31, 2018   38,147      
Beginning Balance at Dec. 31, 2018 1,348,825 $ 381 299,534 1,196,727 (147,817)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 127,243        
Other comprehensive income:          
Cumulative translation adjustment 408        
Issuance of common stock in connection with:          
Stock units issued under incentive compensation plan 1,346        
Ending Balance (in shares) at Jun. 30, 2019   37,612      
Ending Balance at Jun. 30, 2019 1,419,012 $ 376 242,075 1,323,970 (147,409)
Beginning Balance (in shares) at Mar. 31, 2019   38,027      
Beginning Balance at Mar. 31, 2019 1,402,022 $ 380 284,864 1,259,372 (142,594)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 64,598     64,598  
Other comprehensive income:          
Cumulative translation adjustment (4,815)       (4,815)
Issuance of common stock in connection with:          
Exercise of options (in shares)   87      
Exercise of options 3,076 $ 1 3,075    
Restricted share grants, less net settled shares (in shares)   78      
Restricted share grants, less net settled shares (1,351) $ 1 (1,352)    
Purchase and retirement of common stock (in shares)   (580)      
Purchase and retirement of common stock (48,332) $ (6) (48,326)    
Share-based compensation 3,814   3,814    
Ending Balance (in shares) at Jun. 30, 2019   37,612      
Ending Balance at Jun. 30, 2019 $ 1,419,012 $ 376 242,075 1,323,970 (147,409)
Beginning Balance (in shares) at Dec. 31, 2019 37,390 37,390      
Beginning Balance at Dec. 31, 2019 $ 1,489,142 $ 374 216,162 1,413,453 (140,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 56,747     56,747  
Other comprehensive income:          
Cumulative translation adjustment (31,102)       (31,102)
Issuance of common stock in connection with:          
Exercise of options (in shares)   34      
Exercise of options 1,207 $ 1 1,206    
Restricted share grants, less net settled shares (in shares)   136      
Restricted share grants, less net settled shares (6,767) $ 1 (6,768)    
Stock units issued under incentive compensation plan 2,314   2,314    
Purchase and retirement of common stock (in shares)   (450)      
Purchase and retirement of common stock (50,311) $ (5) (50,306)    
Share-based compensation 7,454   7,454    
Ending Balance (in shares) at Mar. 31, 2020   37,110      
Ending Balance at Mar. 31, 2020 $ 1,468,684 $ 371 170,062 1,470,200 (171,949)
Beginning Balance (in shares) at Dec. 31, 2019 37,390 37,390      
Beginning Balance at Dec. 31, 2019 $ 1,489,142 $ 374 216,162 1,413,453 (140,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 104,921        
Other comprehensive income:          
Cumulative translation adjustment (21,534)        
Issuance of common stock in connection with:          
Stock units issued under incentive compensation plan $ 2,314        
Ending Balance (in shares) at Jun. 30, 2020 36,710 36,710      
Ending Balance at Jun. 30, 2020 $ 1,479,103 $ 367 122,743 1,518,374 (162,381)
Beginning Balance (in shares) at Mar. 31, 2020   37,110      
Beginning Balance at Mar. 31, 2020 1,468,684 $ 371 170,062 1,470,200 (171,949)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 48,174     48,174  
Other comprehensive income:          
Cumulative translation adjustment 9,568       9,568
Issuance of common stock in connection with:          
Exercise of options (in shares)   33      
Exercise of options 1,191   1,191    
Restricted share grants, less net settled shares (in shares)   38      
Restricted share grants, less net settled shares (2,154) $ 1 (2,155)    
Purchase and retirement of common stock (in shares)   (471)      
Purchase and retirement of common stock (51,053) $ (5) (51,048)    
Share-based compensation $ 4,693   4,693    
Ending Balance (in shares) at Jun. 30, 2020 36,710 36,710      
Ending Balance at Jun. 30, 2020 $ 1,479,103 $ 367 $ 122,743 $ 1,518,374 $ (162,381)