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Equity Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2015
EQUITY INCENTIVE PLAN [Abstract]  
Schedule of Stock Options, Activity
 
Number of
Options
 
Weighted Average
Exercise Price
 
Aggregate Intrinsic
Value (in millions)
Outstanding at December 31, 2014
1,646,483

 
$133.80
 
$277.7
Granted
108,694

 
312.36
 
 
Exercised
(372,355
)
 
79.37
 
 
Forfeited
(8,117
)
 
208.17
 
 
Outstanding at December 31, 2015
1,374,705

 
$162.29
 
$243.1
Options exercisable at December 31, 2015
1,000,773

 
$130.15
 
$209.1
Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range
Number of Options
Outstanding
 
Weighted Average
Exercise Price
 
Remaining Contractual
Life of Options
Outstanding
 
Options
Exercisable
 
 
 
294,206

 
$
84.18

 
3.4
 
294,206

202,950

 
$
109.00

 
1.9
 
202,950

340,650

 
$
141.50

 
5.3
 
309,259

173,273

 
$
169.37

 
6.8
 
109,023

363,626

 
$
271.34

 
8.8
 
85,335

1,374,705

 
 

 
5.5
 
1,000,773

Schedule of Stock Options, Valuation Assumptions
 
2015
 
2014
 
2013
Risk-free interest rate
1.65
%
 
1.66
%
 
1.31
%
Expected life in years
5.7

 
5.6

 
5.0

Expected volatility
28
%
 
28
%
 
28
%
Expected dividend yield

 

 

Schedule Restricted Stock Units, Activity
 
Number of Restricted
Stock Units
 
Aggregate Intrinsic
Value (in millions)
Outstanding at December 31, 2014
96,097

 
$
29.1

Granted
25,970

 
 

Vested
(31,553
)
 
 

Forfeited
(8,440
)
 
 

Outstanding at December 31, 2015
82,074

 
$
27.8