SHAREHOLDERS' EQUITY (Details 2) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
	Jan. 15, 2016	Aug. 20, 2015	Aug. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jan. 15, 2016	Jun. 30, 2017	Jun. 30, 2016
August 17, 2015 ASR agreement [Member]
Treasury Shares [Line Items]
Total shares (in shares)	1,358,380.00	4,149,378	4,149,378			5,507,758
Total cost			$ 300,000
Average price per share (in usd per share)						$ 54.47
Common Stock [Member]
Treasury Shares [Line Items]
Total shares (in shares)				2,004,000	2,337,000		4,233,000	6,247,000
Total cost				$ 131,070	$ 127,039		$ 282,313	$ 323,050
Average price per share (in usd per share)				$ 65.40	$ 54.36		$ 66.69	$ 51.71
Common Stock [Member] | In the Open Market [Member]
Treasury Shares [Line Items]
Total shares (in shares)				1,987,000	2,300,000		3,883,000	6,004,000
Total cost				$ 129,960	$ 125,000		$ 257,943	$ 310,000
Average price per share (in usd per share)				$ 65.40	$ 54.35		$ 66.44	$ 51.63
Common Stock [Member] | In the Open Market [Member] | August 17, 2015 ASR agreement [Member]
Treasury Shares [Line Items]
Total shares (in shares)							1,358,380
Common Stock [Member] | From Employees [Member]
Treasury Shares [Line Items]
Total shares (in shares)				17,000	37,000		350,000	243,000
Total cost				$ 1,110	$ 2,039		$ 24,370	$ 13,050
Average price per share (in usd per share)				$ 64.82	$ 54.70		$ 69.55	$ 53.65