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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period at Dec. 31, 2019 $ 612,517 $ (388)   $ 380,079 $ 232,438 $ (388)
Balance at beginning of period (in shares) at Dec. 31, 2019     454,755      
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member          
Exercise of common stock options $ 19,478     19,478    
Exercise of common stock options (in shares)     5,393      
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (4,893)     (4,893)    
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)     197      
Stock-based compensation 23,263     23,263    
Net income 24,057       24,057  
Balance at end of period at Mar. 31, 2020 674,034     417,927 256,107  
Balance at end of period (in shares) at Mar. 31, 2020     460,346      
Balance at beginning of period at Dec. 31, 2019 612,517 $ (388)   380,079 232,438 $ (388)
Balance at beginning of period (in shares) at Dec. 31, 2019     454,755      
Net income 90,415          
Balance at end of period at Sep. 30, 2020 832,627     510,162 322,465  
Balance at end of period (in shares) at Sep. 30, 2020     469,452      
Balance at beginning of period at Mar. 31, 2020 674,034     417,927 256,107  
Balance at beginning of period (in shares) at Mar. 31, 2020     460,346      
Exercise of common stock options 22,491     22,491    
Exercise of common stock options (in shares)     4,306      
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (2,836)     (2,836)    
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)     613      
Stock-based compensation 24,516     24,516    
Issuance of common stock under employee stock purchase plan 15,035     15,035    
Issuance of common stock under employee stock purchase plan (in shares)     2,026      
Net income 25,111       25,111  
Balance at end of period at Jun. 30, 2020 758,351     477,133 281,218  
Balance at end of period (in shares) at Jun. 30, 2020     467,291      
Exercise of common stock options 12,118     12,118    
Exercise of common stock options (in shares)     2,245      
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (6,455)     (6,455)    
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)     (84)      
Stock-based compensation 27,366     27,366    
Net income 41,247       41,247  
Balance at end of period at Sep. 30, 2020 832,627     510,162 322,465  
Balance at end of period (in shares) at Sep. 30, 2020     469,452      
Balance at beginning of period at Dec. 31, 2020 1,013,145     538,778 474,367  
Balance at beginning of period (in shares) at Dec. 31, 2020     473,401      
Exercise of common stock options 12,621     12,621    
Exercise of common stock options (in shares)     1,794      
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (17,080)     (17,080)    
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)     110      
Stock-based compensation 52,985     52,985    
Net income 22,642       22,642  
Balance at end of period at Mar. 31, 2021 1,084,313     587,304 497,009  
Balance at end of period (in shares) at Mar. 31, 2021     475,305      
Balance at beginning of period at Dec. 31, 2020 1,013,145     538,778 474,367  
Balance at beginning of period (in shares) at Dec. 31, 2020     473,401      
Net income 129,723          
Balance at end of period at Sep. 30, 2021 1,302,814     698,724 604,090  
Balance at end of period (in shares) at Sep. 30, 2021     480,589      
Balance at beginning of period at Mar. 31, 2021 1,084,313     587,304 497,009  
Balance at beginning of period (in shares) at Mar. 31, 2021     475,305      
Exercise of common stock options 13,718     13,718    
Exercise of common stock options (in shares)     1,401      
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (12,155)     (12,155)    
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)     409      
Stock-based compensation 46,015     46,015    
Issuance of common stock under employee stock purchase plan 22,758     22,758    
Issuance of common stock under employee stock purchase plan (in shares)     1,334      
Net income 47,697       47,697  
Balance at end of period at Jun. 30, 2021 1,202,346     657,640 544,706  
Balance at end of period (in shares) at Jun. 30, 2021     478,449      
Exercise of common stock options 13,220     13,220    
Exercise of common stock options (in shares)     1,808      
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (9,038)     (9,038)    
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares)     307      
Stock-based compensation 35,086     35,086    
Issuance of common stock related to acquisition 1,816     1,816    
Issuance of common stock related to acquisition (in shares)     25      
Net income 59,384       59,384  
Balance at end of period at Sep. 30, 2021 $ 1,302,814     $ 698,724 $ 604,090  
Balance at end of period (in shares) at Sep. 30, 2021     480,589