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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, 2019   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 (loss)          
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 (in shares)   136      
Restricted share grants (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      
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 155,093        
Other comprehensive income (loss)          
Cumulative translation adjustment (204)        
Issuance of common stock in connection with:          
Stock units issued under incentive compensation plan 2,314        
Ending Balance (in shares) at Sep. 30, 2020   36,028      
Ending Balance at Sep. 30, 2020 1,474,497 $ 360 46,642 1,568,546 (141,051)
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 (loss)          
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 (in shares)   38      
Restricted share grants (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      
Ending Balance at Jun. 30, 2020 1,479,103 $ 367 122,743 1,518,374 (162,381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 50,172     50,172  
Other comprehensive income (loss)          
Cumulative translation adjustment 21,330       21,330
Issuance of common stock in connection with:          
Exercise of options (in shares)   43      
Exercise of options 1,536   1,536    
Restricted share grants (in shares)   24      
Restricted share grants (207)   (207)    
Purchase and retirement of common stock (in shares)   (749)      
Purchase and retirement of common stock (82,866) $ (7) (82,859)    
Share-based compensation 5,429   5,429    
Ending Balance (in shares) at Sep. 30, 2020   36,028      
Ending Balance at Sep. 30, 2020 $ 1,474,497 $ 360 46,642 1,568,546 (141,051)
Beginning Balance (in shares) at Dec. 31, 2020 34,481 34,481      
Beginning Balance at Dec. 31, 2020 $ 1,400,181 $ 345 0 1,506,271 (106,435)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 64,496     64,496  
Other comprehensive income (loss)          
Cumulative translation adjustment (5,242)       (5,242)
Issuance of common stock in connection with:          
Exercise of options (in shares)   12      
Exercise of options 434   434    
Restricted share grants (in shares)   157      
Restricted share grants (7,231) $ 1 (7,232)    
Stock units issued under incentive compensation plan 2,603   2,603    
Purchase and retirement of common stock (in shares)   (422)      
Purchase and retirement of common stock (46,133) $ (4) (3,047) (43,082)  
Share-based compensation 7,242   7,242    
Ending Balance (in shares) at Mar. 31, 2021   34,228      
Ending Balance at Mar. 31, 2021 $ 1,416,350 $ 342 0 1,527,685 (111,677)
Beginning Balance (in shares) at Dec. 31, 2020 34,481 34,481      
Beginning Balance at Dec. 31, 2020 $ 1,400,181 $ 345 0 1,506,271 (106,435)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 196,758        
Other comprehensive income (loss)          
Cumulative translation adjustment (18,042)        
Issuance of common stock in connection with:          
Stock units issued under incentive compensation plan $ 2,603        
Purchase and retirement of common stock     (3,000)    
Ending Balance (in shares) at Sep. 30, 2021 34,295 34,295      
Ending Balance at Sep. 30, 2021 $ 1,544,303 $ 343 8,490 1,659,947 (124,477)
Beginning Balance (in shares) at Mar. 31, 2021   34,228      
Beginning Balance at Mar. 31, 2021 1,416,350 $ 342 0 1,527,685 (111,677)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 62,782     62,782  
Other comprehensive income (loss)          
Cumulative translation adjustment 5,807       5,807
Issuance of common stock in connection with:          
Exercise of options (in shares)   33      
Exercise of options 1,137 $ 1 1,136    
Restricted share grants (in shares)   21      
Restricted share grants (1,814)   (1,814)    
Share-based compensation 4,948   4,948    
Ending Balance (in shares) at Jun. 30, 2021   34,282      
Ending Balance at Jun. 30, 2021 1,489,210 $ 343 4,270 1,590,467 (105,870)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 69,480     69,480  
Other comprehensive income (loss)          
Cumulative translation adjustment (18,607)       (18,607)
Issuance of common stock in connection with:          
Exercise of options (in shares)   4      
Exercise of options 126   126    
Restricted share grants (in shares)   9      
Restricted share grants (866)   (866)    
Share-based compensation $ 4,960   4,960    
Ending Balance (in shares) at Sep. 30, 2021 34,295 34,295      
Ending Balance at Sep. 30, 2021 $ 1,544,303 $ 343 $ 8,490 $ 1,659,947 $ (124,477)