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