STOCK-BASED EMPLOYEE COMPENSATION (Schedule of Assumed Stock Options) (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised, total intrinsic value	$ 17,000	$ 26,500
Share Based Compensation Arrangement By Share Based Payment Award Options Vested in Period Number Of Shares	11,170	9,478
Number of Shares
Beginning balance (in shares)	146,385
Assumed in acquisitions (in shares)	1,422
Exercised (in shares)	(21,602)
Forfeited (in shares)	(1,132)
Ending balance (in shares)	125,073.000		146,385
Weighted-Average Exercise Price
Beginning balance (in dollars per share)	$ 380.05
Assumed in acquisitions (in dollars per share)	230.37
Exercised (in dollars per share)	391.00
Forfeited (in dollars per share)	757.64
Ending balance (in dollars per share)	$ 373.03		$ 380.05
Aggregate Intrinsic Value	$ 98,948		$ 111,277
Weighted Average Remaining Contractual Term	6 years 2 months		6 years 6 months
Vested and exercisable as of March 31, 2015
Number of Shares	78,906
Weighted Average Exercise Price (in dollars per share)	$ 305.86
Aggregate Intrinsic Value	$ 67,725
Weighted Average Remaining Contractual Term, Exercisable	5 years 5 months
Vested and exercisable as of March 31, 2015 and unvested expected to vest thereafter, net of estimated forfeitures
Number of Shares	123,968
Weighted Average Exercise Price (in dollars per share)	$ 372.92
Aggregate Intrinsic Value	$ 98,088
Weighted Average Remaining Contractual Term	6 years 2 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 7,500	$ 4,100