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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Balance at Dec. 31, 2020 $ 1,986,111 $ 481 $ 905,332 $ (46) $ 1,112,156 $ (31,812)
Balance, shares at Dec. 31, 2020   48,148,000        
Balance, shares at Dec. 31, 2020           (7,609,000)
Increase (Decrease) in Stockholders' Equity            
Net income $ 106,676       106,676  
Exercise of stock options and vesting of restricted stock units (in shares) 313,000         458,000
Exercise of stock options and vesting of restricted stock units $ 46,433   13,089     $ 33,344
Employee taxes paid for withheld shares upon equity award settlement (in shares)           (40,000)
Employee taxes paid for withheld shares upon equity award settlement (17,461)         $ (17,461)
Stock compensation $ 80,360   80,360      
Issuance of shares pursuant to employee stock purchase plan (in shares) 26,000         26,000
Issuance of shares pursuant to employee stock purchase plan $ 9,757   9,559     $ 198
Treasury stock purchases $ (12,975)         $ (12,975)
Treasury stock purchases (in shares) (32,000)         (32,000)
Purchase Consideration for Converted Stock $ 1,872   1,872      
Balance at Sep. 30, 2021 2,200,773 $ 481 1,010,212 (46) 1,218,832 $ (28,706)
Balance, shares at Sep. 30, 2021   48,148,000        
Balance, shares at Sep. 30, 2021           (7,197,000)
Balance at Jun. 30, 2021 2,107,991 $ 481 962,557 (46) 1,174,662 $ (29,663)
Balance, shares at Jun. 30, 2021   48,148,000        
Balance, shares at Jun. 30, 2021           (7,315,000)
Increase (Decrease) in Stockholders' Equity            
Net income $ 44,170       44,170  
Exercise of stock options and vesting of restricted stock units (in shares) 103,000         112,000
Exercise of stock options and vesting of restricted stock units $ 17,045   14,712     $ 2,333
Employee taxes paid for withheld shares upon equity award settlement (in shares)           (3,000)
Employee taxes paid for withheld shares upon equity award settlement (1,451)         $ (1,451)
Stock compensation $ 29,461   29,461      
Issuance of shares pursuant to employee stock purchase plan (in shares) 9,000         9,000
Issuance of shares pursuant to employee stock purchase plan $ 3,557   3,482     $ 75
Treasury stock purchases $ 0          
Treasury stock purchases (in shares) 0          
Balance at Sep. 30, 2021 $ 2,200,773 $ 481 1,010,212 (46) 1,218,832 $ (28,706)
Balance, shares at Sep. 30, 2021   48,148,000        
Balance, shares at Sep. 30, 2021           (7,197,000)
Balance at Dec. 31, 2021 $ 2,324,032 $ 481 1,075,650 (46) 1,273,614 $ (25,667)
Balance, shares at Dec. 31, 2021 48,147,969 48,148,000        
Balance, shares at Dec. 31, 2021 (6,832,640)         (6,833,000)
Increase (Decrease) in Stockholders' Equity            
Net income $ 133,163       133,163  
Unrealized loss on available-for-sale securities, net of tax $ (800)     (800)    
Exercise of stock options and vesting of restricted stock units (in shares) 140,000         324,000
Exercise of stock options and vesting of restricted stock units $ 21,213   (1,665)     $ 22,878
Employee taxes paid for withheld shares upon equity award settlement (in shares)           (52,000)
Employee taxes paid for withheld shares upon equity award settlement (20,915)         $ (20,915)
Stock compensation $ 77,991   77,991      
Issuance of shares pursuant to employee stock purchase plan (in shares) 36,000         36,000
Issuance of shares pursuant to employee stock purchase plan $ 12,614   12,383     $ 231
Treasury stock purchases $ 0          
Treasury stock purchases (in shares) 0          
Balance at Sep. 30, 2022 $ 2,547,298 $ 481 1,164,359 (846) 1,406,777 $ (23,473)
Balance, shares at Sep. 30, 2022 48,147,969 48,148,000        
Balance, shares at Sep. 30, 2022 (6,525,259)         (6,525,000)
Balance at Jun. 30, 2022 $ 2,458,327 $ 481 1,128,821 (809) 1,353,544 $ (23,710)
Balance, shares at Jun. 30, 2022   48,148,000        
Balance, shares at Jun. 30, 2022           (6,584,000)
Increase (Decrease) in Stockholders' Equity            
Net income 53,233       53,233  
Unrealized loss on available-for-sale securities, net of tax $ (37)     (37)    
Exercise of stock options and vesting of restricted stock units (in shares) 39,000         45,000
Exercise of stock options and vesting of restricted stock units $ 4,990   4,232     $ 758
Employee taxes paid for withheld shares upon equity award settlement (in shares)           (2,000)
Employee taxes paid for withheld shares upon equity award settlement (585)         $ (585)
Stock compensation $ 26,912   26,912      
Issuance of shares pursuant to employee stock purchase plan (in shares) 16,000         16,000
Issuance of shares pursuant to employee stock purchase plan $ 4,458   4,394     $ 64
Treasury stock purchases $ 0          
Treasury stock purchases (in shares) 0          
Balance at Sep. 30, 2022 $ 2,547,298 $ 481 $ 1,164,359 $ (846) $ 1,406,777 $ (23,473)
Balance, shares at Sep. 30, 2022 48,147,969 48,148,000        
Balance, shares at Sep. 30, 2022 (6,525,259)         (6,525,000)