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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Balance at Dec. 31, 2018 $ 1,324,846 $ (1,116) $ 481 $ 731,435 $ (46) $ 771,925 $ (1,116) $ (178,949)
Balance, shares at Dec. 31, 2018     48,148         9,872
Increase (Decrease) in Stockholders' Equity                
Net income 146,527         146,527    
Issuance/ Exercise of stock options $ 96,908     (52,833)       $ 149,741
Issuance/ Exercise of stock options (in shares) 999             1,075
Employee taxes paid for withheld shares upon equity award settlement $ (5,361)             $ (5,361)
Employee taxes paid for withheld shares for taxes upon equity award settlement (in shares)               (23)
Stock compensation 59,967     59,967        
Issuance of shares pursuant to employee stock purchase plan $ 9,576     909       $ 8,667
Issuance of shares pursuant to employee stock purchase plan (in shares) 53             53
Treasury stock purchases $ (14,289)             $ (14,289)
Treasury stock purchases (in shares) (72)             (72)
Balance at Dec. 31, 2019 $ 1,617,058   $ 481 739,478 (46) 917,336   $ (40,191)
Balance, shares at Dec. 31, 2019     48,148         8,839
Increase (Decrease) in Stockholders' Equity                
Net income 194,820         194,820    
Issuance/ Exercise of stock options $ 124,363     90,636       $ 33,727
Issuance/ Exercise of stock options (in shares) 1,174             1,283
Employee taxes paid for withheld shares upon equity award settlement $ (12,923)             $ (12,923)
Employee taxes paid for withheld shares for taxes upon equity award settlement (in shares)               (34)
Stock compensation 67,365     67,365        
Issuance of shares pursuant to employee stock purchase plan $ 10,912     7,853       $ 3,059
Issuance of shares pursuant to employee stock purchase plan (in shares) 40             40
Treasury stock purchases $ (15,484)             $ (15,484)
Treasury stock purchases (in shares) (59)             (59)
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         7,609
Increase (Decrease) in Stockholders' Equity                
Net income 161,458         161,458    
Issuance/ Exercise of stock options $ 96,714     50,831       $ 45,883
Issuance/ Exercise of stock options (in shares) 627             832
Employee taxes paid for withheld shares upon equity award settlement $ (27,030)             $ (27,030)
Employee taxes paid for withheld shares for taxes upon equity award settlement (in shares)               (58)
Stock compensation 104,726     104,726        
Issuance of shares pursuant to employee stock purchase plan $ 13,158     12,889       $ 269
Issuance of shares pursuant to employee stock purchase plan (in shares) 35             35
Treasury stock purchases $ (12,977)             $ (12,977)
Treasury stock purchases (in shares) (33)             (33)
Purchase consideration for conversion of unvested restricted stock awards $ 1,872     1,872        
Balance at Dec. 31, 2021 $ 2,324,032   $ 481 $ 1,075,650 $ (46) $ 1,273,614   $ (25,667)
Balance, shares at Dec. 31, 2021     48,148         6,833