TREASURY STOCK (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Remaining authorization to repurchase common stock	$ 9,800,000
Treasury stock shares acquired	373,119		124,915
Treasury stock value acquired	$ 731,592		$ 212,300
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)	59,043		44,888
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation	$ 119,900		$ 77,300
Payments Related to Tax Withholding for Share-based Compensation	$ 103,200		$ 69,800
Treasury stock, shares (in shares)	14,589,938	14,216,819
Repurchase Program (Q12016)
Equity, Class of Treasury Stock [Line Items]
Amount of common stock repurchases authorized				$ 3,000,000
Treasury stock shares acquired			80,027
Treasury stock value acquired			$ 135,000
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	13,578
Treasury Stock Repurchased but unsettled by period end, amount	$ 28,000
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	314,076
Treasury stock value acquired	$ 611,700