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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)
Beginning balance (in shares) at Dec. 31, 2018     48,148         (9,872)
Increase (Decrease) in Stockholders' Equity                
Net income 99,737         99,737    
Exercise of stock options and vesting of restricted stock units $ 62,295     (82,449)       $ 144,744
Exercise of stock options and vesting of restricted stock units (in shares) 691             746
Employee taxes paid for withheld shares upon equity award settlement $ (3,572)             $ (3,572)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (17)
Stock compensation 44,369     44,369        
Issuance of shares pursuant to employee stock purchase plan $ 7,327     (769)       $ 8,096
Issuance of shares pursuant to employee stock purchase plan (in shares) 43             43
Treasury stock purchases $ (14,289)             $ (14,289)
Treasury stock purchases (in shares) (72)             (72)
Balance at Sep. 30, 2019 $ 1,519,597   $ 481 692,586 (46) 870,546   $ (43,970)
Ending balance (in shares) at Sep. 30, 2019     48,148         (9,172)
Balance at Jun. 30, 2019 1,421,630   $ 481 715,920 (46) 830,156   $ (124,881)
Beginning balance (in shares) at Jun. 30, 2019     48,148         (9,582)
Increase (Decrease) in Stockholders' Equity                
Net income 40,390         40,390    
Exercise of stock options and vesting of restricted stock units $ 40,163     (38,160)       $ 78,323
Exercise of stock options and vesting of restricted stock units (in shares) 395             396
Employee taxes paid for withheld shares upon equity award settlement $ (191)             $ (191)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (1)
Stock compensation 14,887     14,887        
Issuance of shares pursuant to employee stock purchase plan $ 2,718     (61)       $ 2,779
Issuance of shares pursuant to employee stock purchase plan (in shares) 15             15
Treasury stock purchases $ 0              
Treasury stock purchases (in shares) 0              
Balance at Sep. 30, 2019 $ 1,519,597   $ 481 692,586 (46) 870,546   $ (43,970)
Ending balance (in shares) at Sep. 30, 2019     48,148         (9,172)
Balance at Dec. 31, 2019 1,617,058   $ 481 739,478 (46) 917,336   $ (40,191)
Beginning balance (in shares) at Dec. 31, 2019     48,148         (8,839)
Increase (Decrease) in Stockholders' Equity                
Net income 140,726         140,726    
Exercise of stock options and vesting of restricted stock units $ 100,732     74,162       $ 26,570
Exercise of stock options and vesting of restricted stock units (in shares) 989             1,055
Employee taxes paid for withheld shares upon equity award settlement $ (7,208)             $ (7,208)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (20)
Stock compensation 54,112     54,112        
Issuance of shares pursuant to employee stock purchase plan $ 8,209     5,211       $ 2,998
Issuance of shares pursuant to employee stock purchase plan (in shares) 31             31
Treasury stock purchases $ (15,484)             $ (15,484)
Treasury stock purchases (in shares) (59)             (59)
Balance at Sep. 30, 2020 $ 1,898,145   $ 481 872,963 (46) 1,058,062   $ (33,315)
Ending balance (in shares) at Sep. 30, 2020     48,148         (7,832)
Balance at Jun. 30, 2020 1,829,328   $ 481 843,998 (46) 1,018,778   $ (33,883)
Beginning balance (in shares) at Jun. 30, 2020     48,148         7,917
Increase (Decrease) in Stockholders' Equity                
Net income 39,284         39,284    
Exercise of stock options and vesting of restricted stock units $ 8,395     7,578       $ 817
Exercise of stock options and vesting of restricted stock units (in shares) 72             75
Employee taxes paid for withheld shares upon equity award settlement $ (316)             $ (316)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (1)
Stock compensation 18,424     18,424        
Issuance of shares pursuant to employee stock purchase plan $ 3,032     2,963       $ 69
Issuance of shares pursuant to employee stock purchase plan (in shares) 11             11
Treasury stock purchases $ (2)             $ (2)
Treasury stock purchases (in shares) 0              
Balance at Sep. 30, 2020 $ 1,898,145   $ 481 $ 872,963 $ (46) $ 1,058,062   $ (33,315)
Ending balance (in shares) at Sep. 30, 2020     48,148         (7,832)