STOCK-BASED COMPENSATION (Schedule of Assumed Stock Options) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Vested and exercisable and expected to vest thereafter, net of estimated forfeitures
Stock-based compensation expense	$ 249,574	$ 247,395	$ 186,425
Employee Stock Option
Number of Shares
Balance, (in shares)	89,104.000	146,385.000	137,708
Assumed in acquisitions (in shares)		1,422	61,897
Exercised (in shares)	(38,150)	(52,697)	(51,003)
Forfeited (in shares)	(1,971)	(6,006)	(2,217)
Balance, (in shares)	48,983.000	89,104.000	146,385.000	137,708
Weighted Average Exercise Price
Balance, (in dollars per share)	$ 383.03	$ 380.05	$ 315.36
Assumed in acquisitions (in dollars per share)		230.37	457.67
Exercised (in dollars per share)	404.40	355.85	293.59
Forfeited (in dollars per share)	241.65	511.87	517.91
Balance, (in dollars per share)	$ 372.07	$ 383.03	$ 380.05	$ 315.36
Aggregate Intrinsic Value (000's)
Aggregate Intrinsic Value	$ 53,587	$ 79,474	$ 111,277	$ 116,686
Weighted Average Remaining Contractual Term	4 years 5 months	5 years 5 months	6 years 6 months	6 years 7 months
Vested and exercisable
Number of Shares	46,601
Weighted Average Exercise Price (in dollars per share)	$ 351.22
Aggregate Intrinsic Value	$ 51,953
Weighted Average Remaining Contractual Term	4 years 3 months
Vested and exercisable and expected to vest thereafter, net of estimated forfeitures
Number of Shares	48,931
Weighted Average Exercise Price (in dollars per share)	$ 372.11
Aggregate Intrinsic Value	$ 53,528
Weighted Average Remaining Contractual Term	4 years 5 months
Stock options exercised, total intrinsic value	$ 35,100	$ 46,300	$ 49,200
Stock options vested in period	12,180	38,689	41,524
Stock options vested in period, fair value	$ 7,600	$ 24,400	$ 24,200
Stock-based compensation expense	6,800	24,900	24,700
Total future compensation cost related to unvested options	$ 1,300
Total future compensation cost related to unvested options, expected period of recognition (in years)	1 year
Employee Stock Option | Assumed in an acquisition
Vested and exercisable and expected to vest thereafter, net of estimated forfeitures
Acquisition date fair value of assumed options		$ 1,400	$ 45,500
Acquisition date fair value per share of assumed stock options		$ 1,015.81	$ 734.76