TREASURY STOCK (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 03, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	Mar. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Remaining authorization to repurchase common stock		$ 3,100,000		$ 3,100,000
Treasury stock shares acquired				632,006	581,828
Treasury stock value acquired				$ 1,142,717	$ 757,500
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)				54,438	122,134
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation				$ 95,100	$ 159,500
Payments Related to Tax Withholding for Share-based Compensation				$ 95,500	$ 156,400
Treasury stock, shares (in shares)		13,822,935	13,190,929	13,822,935
Repurchase Program (Q12016) [Member]
Equity, Class of Treasury Stock [Line Items]
Amount of common stock repurchases authorized							$ 3,000,000
Treasury stock shares acquired				577,568	459,694
Treasury stock value acquired				$ 1,000,000	$ 598,000
Treasury Stock Repurchased but unsettled by period end		19,238	10,215
Treasury Stock Repurchased but unsettled by period end, amount		$ 35,000	$ 15,000
Repurchase Program (Q12017) [Member]
Equity, Class of Treasury Stock [Line Items]
Amount of common stock repurchases authorized						$ 2,000,000
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury stock shares acquired	86,882
Treasury stock value acquired	$ 166,100