TREASURY STOCK (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Remaining authorization to repurchase common stock	$ 8,600,000	$ 2,400,000	$ 8,600,000
Treasury stock shares acquired			945,693	312,518
Treasury stock value acquired			$ 1,931,532	$ 556,200
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)			71,707	50,966
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation			$ 146,300	$ 88,600
Payments Related to Tax Withholding for Share-based Compensation			$ 145,000	$ 86,500
Treasury stock, shares (in shares)	15,162,512	14,216,819	15,162,512
Repurchase Program (Q12016)
Equity, Class of Treasury Stock [Line Items]
Amount of common stock repurchases authorized							$ 3,000,000
Treasury stock shares acquired				261,552
Treasury stock value acquired				$ 467,600
Treasury Stock Repurchased but unsettled by period end		18,217
Treasury Stock Repurchased but unsettled by period end, amount		$ 32,000
Repurchase Program (Q12017)
Equity, Class of Treasury Stock [Line Items]
Amount of common stock repurchases authorized						$ 2,000,000
Treasury Stock Repurchased but unsettled by period end	28,241
Treasury Stock Repurchased but unsettled by period end, amount	$ 57,000
Repurchase Program (Q12018)
Equity, Class of Treasury Stock [Line Items]
Amount of common stock repurchases authorized					$ 8,000,000
Repurchase Program (Q12016) and (Q12017)
Equity, Class of Treasury Stock [Line Items]
Treasury stock shares acquired			873,986
Treasury stock value acquired			$ 1,800,000