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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss), Net
Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2015   79,500      
Beginning Balance at Dec. 31, 2015 $ 847,926 $ 8 $ 821,507 $ (980) $ 27,391
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 189,682       189,682
Net change in unrealized gains (losses) from investments 712     712  
Net change in foreign currency translation adjustment (670)   0 (670)  
Issuance of common stock relating to employee equity compensation plans (in shares)   1,163      
Issuance of common stock relating to employee equity compensation plans 13,778 $ 0 13,778    
Tax withholdings related to net share settlements of restricted stock units (29,857)   (29,857)    
Common stock repurchased and retired (shares)   (1,110)      
Common stock repurchased and retired (96,218)   (10,593)   (85,625)
Net tax benefits from stock-based awards 15,888   15,888    
Stock-based compensation 54,148   54,148    
Ending Balance (in shares) at Dec. 31, 2016   79,553      
Ending Balance at Dec. 31, 2016 999,307 $ 8 864,871 (938) 135,366
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 231,418       231,418
Net change in unrealized gains (losses) from investments (232)     (232)  
Net change in foreign currency translation adjustment 1,741   0 1,741  
Issuance of common stock relating to employee equity compensation plans (in shares)   1,073      
Issuance of common stock relating to employee equity compensation plans 14,461 $ 0 14,461    
Tax withholdings related to net share settlements of restricted stock units (46,168)   (46,168)    
Common stock repurchased and retired (shares)   (586)      
Common stock repurchased and retired (103,793)   (5,583)   (98,210)
Stock-based compensation 58,854   58,854    
Ending Balance (in shares) at Dec. 31, 2017   80,040      
Ending Balance at Dec. 31, 2017 1,154,288 $ 8 886,435 571 267,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 400,235        
Net change in unrealized gains (losses) from investments 286     286  
Net change in foreign currency translation adjustment (3,631)     (3,631)  
Issuance of common stock relating to employee equity compensation plans (in shares)   795      
Issuance of common stock relating to employee equity compensation plans 16,635   16,635    
Tax withholdings related to net share settlements of restricted stock units (86,067)   (86,067)    
Common stock repurchased and retired (shares)   (1,057)      
Common stock repurchased and retired (300,002)   (10,252)   (289,750)
Stock-based compensation 70,763   70,763    
Other 384       384
Ending Balance (in shares) at Dec. 31, 2018   79,778      
Ending Balance at Dec. 31, 2018 $ 1,252,891 $ 8 $ 877,514 $ (2,774) $ 378,143