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Consolidated Statements of Stockholders' Equity (unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2019 $ 1,160,318 $ 353   $ 357,032 $ (38,164) $ 841,097
Beginning Balance, Shares at Dec. 31, 2019   35,263        
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Value (5,713) $ 2   (5,715)    
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Shares   272        
Stock-based compensation expense 11,754     11,754    
Repurchase of treasury stock, Amount (25,000)   $ (25,000)      
Repurchase of treasury stock, Shares     (445)      
Retirement of treasury stock, Amount   $ (4) $ 25,000 (4,504)   (20,492)
Retirement of treasury stock, Shares   (445) 445      
Foreign currency translation adjustments, net of tax 2,280       2,280  
Net earnings 119,252         119,252
Ending Balance at Sep. 30, 2020 1,262,891 $ 351   358,567 (35,884) 939,857
Ending Balance, Shares at Sep. 30, 2020   35,090        
Beginning Balance at Jun. 30, 2020 1,207,356 $ 351   354,431 (48,376) 900,950
Beginning Balance, Shares at Jun. 30, 2020   35,070        
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Value (376)     (377)   1
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Shares   20        
Stock-based compensation expense 4,513     4,513    
Foreign currency translation adjustments, net of tax 12,492       12,492  
Net earnings 38,906         38,906
Ending Balance at Sep. 30, 2020 1,262,891 $ 351   358,567 (35,884) 939,857
Ending Balance, Shares at Sep. 30, 2020   35,090        
Beginning Balance at Dec. 31, 2020 1,342,429 $ 351   364,288 (15,455) 993,245
Beginning Balance, Shares at Dec. 31, 2020   35,103        
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Value (8,441) $ 3   (8,444)    
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Shares   279        
Stock-based compensation expense 13,950     13,950    
Repurchase of treasury stock, Amount (50,000)   $ (50,000)      
Repurchase of treasury stock, Shares     (497)      
Retirement of treasury stock, Amount   $ (5) $ 50,000 (5,095)   (44,900)
Retirement of treasury stock, Shares   (497) 497      
Foreign currency translation adjustments, net of tax (6,228)       (6,228)  
Net earnings 157,212         157,212
Ending Balance at Sep. 30, 2021 1,448,922 $ 349   364,699 (21,683) 1,105,557
Ending Balance, Shares at Sep. 30, 2021   34,885        
Beginning Balance at Jun. 30, 2021 1,401,827 $ 348   361,412 (10,007) 1,050,074
Beginning Balance, Shares at Jun. 30, 2021   34,845        
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Value (1,287) $ 1   (1,288)    
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes, Shares   40        
Stock-based compensation expense 4,575     4,575    
Foreign currency translation adjustments, net of tax (11,676)       (11,676)  
Net earnings 55,483         55,483
Ending Balance at Sep. 30, 2021 $ 1,448,922 $ 349   $ 364,699 $ (21,683) $ 1,105,557
Ending Balance, Shares at Sep. 30, 2021   34,885