Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Stock Options) (Details)

v3.20.4
STOCK-BASED COMPENSATION (Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock-based compensation, additional disclosures [Abstract]      
Intrinsic value of stock options exercised $ 87,900 $ 39,600 $ 28,100
Proceeds from exercise of stock options $ 30,647 $ 14,104 $ 22,568
Shares available for future grants (in shares) 19,000    
Total intrinsic value, options outstanding $ 508,600    
Total intrinsic value, options exercisable $ 498,700    
Stock Option [Member]      
Summary of stock option activity [Roll Forward]      
Outstanding at beginning of period (in shares) 11,347 11,784 14,239
Granted (in shares) 51 487 255
Exercised (in shares) (2,071) (910) (2,694)
Forfeited or expired (in shares) (4) (14) (16)
Outstanding at end of period (in shares) 9,323 11,347 11,784
Exercisable at end of period (in shares) 8,827 10,493 10,693
Summary of stock option activity, additional disclosures [Abstract]      
Outstanding at beginning of period (in dollars per share) $ 18.36 $ 16.55 $ 14.52
Granted (in dollars per share) 66.27 57.00 44.05
Exercised (in dollars per share) 16.96 15.50 8.38
Forfeited or expired (in dollars per share) 41.71 10.82 28.57
Outstanding at end of period (in dollars per share) 18.93 18.36 16.55
Exercisable at end of period (in dollars per share) 16.98 15.77 14.61
Weighted average fair value per option granted (in dollars per share) $ 13.62 $ 18.50 $ 14.05
Stock-based compensation, additional disclosures [Abstract]      
Expiration period 10 years    
Stock Incentive Plan [Member]      
Stock-based compensation, additional disclosures [Abstract]      
Shares available for future grants (in shares) 5,600    
Minimum [Member] | Stock Option [Member]      
Stock-based compensation, additional disclosures [Abstract]      
Vesting Period 1 year    
Maximum [Member] | Stock Option [Member]      
Stock-based compensation, additional disclosures [Abstract]      
Vesting Period 4 years