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STOCK-BASED EMPLOYEE COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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, 2016
Share-Based Awards
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested at December 31, 2015
 
637,257

 
 
$
1,070.10

 
Granted
 
193,601

 
 
$
1,304.28

 
Vested
 
(286,354
)
 
 
$
840.45

 
Performance Share Units Adjustment
 
2,865

 
 
$
1,269.87

 
Forfeited
 
(66,232
)
 
 
$
1,276.01

 
Unvested at September 30, 2016
 
481,137

 
 
$
1,281.80

 
 
Schedule of share-based compensation, stock options, activity
Stock Options

All outstanding employee stock options were assumed in acquisitions. The following table summarizes the activity for stock options during the nine months ended September 30, 2016
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, 2015
 
89,104

 
 
$
383.03

 
 
$
79,474

 
5.4
Exercised
 
(34,523
)
 
 
$
380.49

 
 
 
 
 
Forfeited
 
(1,814
)
 
 
$
230.59

 
 
 
 
 
Balance, September 30, 2016
 
52,767

 
 
$
389.93

 
 
$
57,071

 
4.8
Vested and exercisable as of September 30, 2016
 
49,430

 
 
$
366.11

 
 
$
54,639

 
4.6
Vested and exercisable as of September 30, 2016 and expected to vest thereafter, net of estimated forfeitures
 
52,677

 
 
$
389.98

 
 
$
56,971

 
4.8