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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Beginning balance (in shares) at Dec. 31, 2018   35,482        
Beginning balance at Dec. 31, 2018 $ 986,989 $ 355   $ 323,622 $ (41,653) $ 704,665
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes (in shares)   322        
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes 6,572 $ 3   6,575    
Stock-based compensation expense 16,011     16,011    
Equity component of convertible senior notes, net of deferred tax of $14,819 and issuance costs of $1,700 44,731     44,731    
Issuance of warrants related to convertible senior notes 34,440     34,440    
Purchase of note hedge related to convertible senior notes, net of deferred tax of $16,047 (50,278)          
Repurchase of treasury stock (in shares)     (541)      
Repurchase of treasury stock (27,899)   $ (27,899)      
Retirement of treasury stock (in shares)   541 541      
Retirement of treasury stock   $ 5 $ 27,899 4,919   22,975
Foreign currency translation adjustments, net of tax 3,489       3,489  
Net earnings 159,407         159,407
Ending balance (in shares) at Dec. 31, 2019   35,263        
Ending balance at Dec. 31, 2019 1,160,318 $ 353   357,032 (38,164) 841,097
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes (in shares)   285        
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes 5,964 $ 3   5,967    
Stock-based compensation expense 17,727     17,727    
Repurchase of treasury stock (in shares)     (445)      
Repurchase of treasury stock (25,000)   $ (25,000)      
Retirement of treasury stock (in shares)   445 445      
Retirement of treasury stock 2 $ 5 $ 25,000 4,504 1 20,492
Foreign currency translation adjustments, net of tax 22,710       22,710  
Net earnings 172,640         172,640
Ending balance (in shares) at Dec. 31, 2020   35,103        
Ending balance at Dec. 31, 2020 1,342,429 $ 351   364,288 (15,455) 993,245
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes (in shares)   291        
Issuance of common stock under employee stock plans, net of shares withheld for payroll taxes 9,109 $ 3   9,112    
Stock-based compensation expense 18,201     18,201    
Repurchase of treasury stock (in shares)     (497)      
Repurchase of treasury stock (50,000)   $ (50,000)      
Retirement of treasury stock (in shares)   497 497      
Retirement of treasury stock   $ 5 $ 50,000 5,095   44,900
Foreign currency translation adjustments, net of tax (11,639)       (11,639)  
Net earnings 219,345         219,345
Ending balance (in shares) at Dec. 31, 2021   34,897        
Ending balance at Dec. 31, 2021 $ 1,509,227 $ 349   $ 368,282 $ (27,094) $ 1,167,690