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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of option activity
Option activity was as follows:
 
 
Number of
Shares
 
Range of
Exercise Price
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contract
Life (in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2015
400,077

 
$36.48 - $201.04
 
$
122.30

 
 
 
 
Granted
82,400

 
$182.75 - $182.75
 
$
182.75

 
 
 
 
Exercised
(29,285
)
 
$36.48 - $201.04
 
$
112.78

 
 
 
 
Canceled or expired
(13,034
)
 
$193.69 - $201.04
 
$
195.78

 
 
 
 
Outstanding at December 31, 2016
440,158

 
$36.48 - $201.04
 
$
132.08

 
 
 
 
Granted
95,500

 
$204.91
 
$
204.91

 
 
 
 
Exercised
(81,815
)
 
$36.48 - $201.04
 
$
83.07

 
 
 
 
Outstanding at December 31, 2017
453,843

 
$36.73 - $204.91
 
$
156.24

 

 

Granted
82,500

 
342.13
 
$
342.13

 
 
 
 
Exercised
(177,299
)
 
$36.73 - $204.91
 
$
125.16

 
 
 
 
Canceled or expired
(14,768
)
 
$182.75 - $342.13
 
$
261.20

 
 
 
 
Outstanding at December 31, 2018
344,276

 
$36.73 - $342.13
 
$
212.28

 
7.03
 
$
43,418

 
 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2016
284,489

 
$36.48 - $201.04
 
$
100.94

 
 
 
 
Exercisable at December 31, 2017
278,239

 
$36.73 - $201.04
 
$
130.91

 

 

Exercisable at December 31, 2018
185,405

 
$54.51 - $204.91
 
$
165.31

 
5.79
 
$
31,895
Summarized information regarding options outstanding
The following table summarizes information regarding options outstanding at December 31, 2018:
 
 
 Options Outstanding
 
 Options Exercisable
Range of
Exercise Price
 
 Number of
Shares
 
Weighted-Average Remaining Contractual Life (in years)
 
Weighted-
Average
Exercise Price
 
Number of
Shares
 
Weighted-
Average 
Exercise Price
$54.51 - $78.33
 
300

 
1.92
 
$
54.51

 
300

 
$
54.51

$78.34 - $142.45
 
58,844

 
4.19
 
$
102.16

 
58,844

 
$
102.16

$142.46 - $188.22
 
57,768

 
7.19
 
$
182.75

 
33,033

 
$
182.75

$188.23 - $197.37
 
34,264

 
6.17
 
$
193.69

 
34,264

 
$
193.69

$197.38 - $202.98
 
34,600

 
5.16
 
$
201.04

 
34,600

 
$
201.04

$202.99 - $273.52
 
82,500

 
8.16
 
$
204.91

 
24,364

 
$
204.91

$273.53 - $342.13
 
76,000

 
9.16
 
$
342.13

 
—

 
$
—

$54.51 - $342.13
 
344,276

 
7.03
 
$
212.28

 
185,405

 
$
165.31
Unvested restricted stock awards activity
The following table presents unvested restricted stock awards activity for the year ended December 31, 2018:

 
Restricted Stock Awards — without Market Condition
 
Restricted Stock Awards — with Market Condition
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value per Share
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value per Share
Unvested restricted stock awards at December 31, 2017                                   
363,883

 
$
206.59

 
85,200

 
$
205.08

Granted
134,209

 
$
358.51

 
26,160

 
$
380.24

Vested
(151,995
)
 
$
193.70

 
(27,360
)
 
$
361.20

Canceled
(41,936
)
 
$
258.19

 
(7,680
)
 
$
361.20

Unvested restricted stock awards at December 31, 2018
304,161

 
$
272.95

 
76,320

 
$
193.44
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value assumption for options granted
The Company estimated the fair value of each option granted on the date of grant using the Black-Scholes option-pricing model, using the assumptions in the following table:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Dividend yield
0
%
 
0
%
 
0
%
Expected volatility
28
%
 
28
%
 
31
%
Risk-free interest rate
3
%
 
2
%
 
1
%
Expected life (in years)
5

 
5

 
5
Performance-based RSAs - with Market Condition [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value assumption for options granted
The assumptions used to estimate the fair value of performance-based restricted common stock awards with a market condition granted were as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Dividend yield
0
%
 
0
%
 
0
%
Expected volatility
28
%
 
28
%
 
28
%
Risk-free interest rate
2
%
 
2
%
 
1
%
Expected life (in years)
3

 
3

 
3

Weighted-average grant date fair value
$
342.13

 
$
218.59

 
$
184.97
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested restricted stock awards activity
The following table presents unvested restricted stock units activity for the year ended December 31, 2018:

 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value per Share
Unvested restricted stock units at December 31, 2017
962

 
$
190.27

Granted
214

 
$
342.13

Vested
(324
)
 
$
189.08

Canceled
—

 
$
—

Unvested restricted stock units at December 31, 2018
852

 
$
228.86