Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Stock Options) (Details)

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STOCK-BASED COMPENSATION (Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-based compensation, additional disclosures [Abstract]      
Intrinsic value of stock options exercised $ 39,600 $ 28,100 $ 57,500
Exercise of stock options 14,104 (24,327) 51,069
Proceeds from exercise of stock options $ 14,104 $ 22,568 $ 51,069
Shares available for future grants (in shares) 22,100    
Total intrinsic value, options outstanding $ 811,000    
Total intrinsic value, options exercisable $ 749,900    
Stock Option [Member]      
Summary of stock option activity [Roll Forward]      
Outstanding at beginning of period (in shares) 11,784 14,239 16,283
Granted (in shares) 487 255 1,164
Exercised (in shares) (910) (2,694) (3,138)
Forfeited or expired (in shares) (14) (16) (70)
Outstanding at end of period (in shares) 11,347 11,784 14,239
Exercisable at end of period (in shares) 10,493 10,693 11,906
Summary of stock option activity, additional disclosures [Abstract]      
Outstanding at beginning of period (in dollars per share) $ 16.55 $ 14.52 $ 13.55
Granted (in dollars per share) 57.00 44.05 33.48
Exercised (in dollars per share) 15.50 8.38 16.27
Forfeited or expired (in dollars per share) 10.82 28.57 24.05
Outstanding at end of period (in dollars per share) 18.36 16.55 14.52
Exercisable at end of period (in dollars per share) 15.77 14.61 12.00
Weighted average fair value per option granted (in dollars per share) $ 18.50 $ 14.05 $ 10.18
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) 7,100    
Minimum [Member] | Stock Option [Member]      
Stock-based compensation, additional disclosures [Abstract]      
Vesting Period 2 years    
Maximum [Member] | Stock Option [Member]      
Stock-based compensation, additional disclosures [Abstract]      
Vesting Period 5 years