STOCK-BASED EMPLOYEE COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Activity of unvested restricted stock units and performance share units

Restricted Stock Units and Performance Share Units

The following table summarizes the activity of restricted stock units and performance share units ("share-based awards") during the nine months ended September 30, 2014: 

Share-Based Awards	Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2013	534,319			$	615.10
Granted	121,534			$	1,316.18
Assumed in an acquisition	43,993			$	1,238.68
Vested	(184,678	)		$	477.07
Performance Share Units Adjustment	28,516			$	787.71
Forfeited	(6,661	)		$	919.88
Unvested at September 30, 2014	537,023			$	877.70

Schedule of share-based compensation, stock options, activity

Stock Options Assumed in Acquisitions

The following table summarizes the activity for the nine months ended September 30, 2014 for employee stock options assumed in acquisitions: 

Assumed Employee Stock Options	Number of Shares		Weighted Average  Exercise Price			Aggregate  Intrinsic Value (in thousands)			Weighted Average Remaining Contractual Term (in years)
Balance, December 31, 2013	128,708			$	335.83		$	106,386	6.9
Assumed in acquisitions	61,897			$	457.67
Exercised	(36,322	)		$	324.18
Forfeited	(928	)		$	599.98
Balance, September 30, 2014	153,355			$	386.16		$	118,453	6.8
Vested and exercisable as of September 30, 2014	80,425			$	289.79		$	69,873	5.8
Vested and exercisable as of September 30, 2014 and unvested expected to vest thereafter, net of estimated forfeitures	152,028			$	386.04		$	117,447	6.8