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Equity Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2013
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, 2012
2,104,775

 
$94.45
 
$208.9
Granted
135,858

 
244.99
 
 
Exercised
(352,602
)
 
56.00
 
 
Forfeited
(16,337
)
 
115.04
 
 
Outstanding at December 31, 2013
1,871,694

 
$112.57
 
$243.7
Options exercisable at December 31, 2013
1,377,919

 
$90.35
 
$209.8
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
 
 
 
84,157

 
$
46.32

 
1.0
 
84,157

339,250

 
$
61.57

 
2.8
 
339,250

472,789

 
$
81.31

 
5.3
 
433,569

298,050

 
$
108.90

 
3.9
 
298,050

359,084

 
$
141.51

 
7.3
 
181,965

318,364

 
$
201.64

 
9.3
 
40,928

1,871,694

 
 

 
5.5
 
1,377,919

Schedule of Stock Options, Valuation Assumptions
 
2013
 
2012
 
2011
Risk-free interest rate
1.31
%
 
0.71
%
 
1.09
%
Expected life in years
5

 
5

 
5

Expected volatility
28
%
 
30
%
 
30
%
Expected dividend yield

 

 

Schedule Restricted Stock Units, Activity
 
Number of Restricted
Stock Units
 
Aggregate Intrinsic
Value (in millions)
Outstanding at December 31, 2012
131,025

 
$
25.3

Granted
29,507

 
 

Vested
(46,044
)
 
 

Forfeited
(6,706
)
 
 

Outstanding at December 31, 2013
107,782

 
$
26.1