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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Activity of unvested 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 years ended December 31, 2015, 2016 and 2017:
 
Share-based Awards
 
Shares
Weighted-average Grant
Date Fair Value
 
 
 
 
 
 
Unvested at December 31, 2014
 
570,315

 
$
912.26

 
 
 
 
 
 
 
Granted
 
198,141

 
$
1,226.41

 
Vested
 
(161,862
)
 
$
757.66

 
Performance Shares Adjustment
 
64,328

 
$
1,238.30

 
Forfeited/Canceled
 
(33,665
)
 
$
1,151.70

 
Unvested at December 31, 2015
 
637,257

 
$
1,070.10

 
 
 
 
 
 
 
Granted
 
202,740

 
$
1,314.93

 
Vested
 
(298,753
)
 
$
858.23

 
Performance Shares Adjustment
 
52,224

 
$
1,294.84

 
Forfeited/Canceled
 
(77,862
)
 
$
1,278.06

 
Unvested at December 31, 2016
 
515,606

 
$
1,287.88

 
 
 
 
 
 
 
Granted
 
174,507

 
$
1,740.78

 
Vested
 
(143,771
)
 
$
1,316.26

 
Performance Shares Adjustment
 
19,357

 
$
1,501.48

 
Forfeited/Canceled
 
(41,003
)
 
$
1,416.09

 
Unvested at December 31, 2017
 
524,696

 
$
1,431.88

 
Schedule of share-based compensation, stock options, activity
The following table summarizes the activity for stock options during the years ended December 31, 2015, 2016 and 2017:
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, 2014
 
146,385

 
 
$
380.05

 
 
$
111,277

 
6.5
Assumed in acquisitions
 
1,422

 
 
$
230.37

 
 
 
 
 
Exercised
 
(52,697
)
 
 
$
355.85

 
 
 
 
 
Forfeited
 
(6,006
)
 
 
$
511.87

 
 
 
 
 
Balance, December 31, 2015
 
89,104

 
 
$
383.03

 
 
$
79,474

 
5.4
Exercised
 
(38,150
)
 
 
$
404.40

 
 
 
 
 
Forfeited
 
(1,971
)
 
 
$
241.65

 
 
 
 
 
Balance, December 31, 2016
 
48,983

 
 
$
372.07

 
 
$
53,587

 
4.4
Exercised
 
(17,359
)
 
 
$
294.45

 
 
 
 
 
Forfeited
 
(949
)
 
 
$
837.09

 
 
 
 
 
Balance, December 31, 2017
 
30,675

 
 
$
401.61

 
 
$
40,986

 
3.9
Vested and exercisable as of December 31, 2017
 
30,504

 
 
$
398.63

 
 
$
40,848

 
3.9
Vested and exercisable as of December 31, 2017 and expected to vest thereafter
 
30,675

 
 
$
401.61

 
 
$
40,986

 
3.9