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SHARE-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Assumptions Used
The weighted average assumptions for the six months ended June 30, 2015 and 2014 are noted in the following table:
 
Six Months Ended 
 June 30,
 
2015
 
2014
Expected life (years)
6.2

 
6.3

Expected volatility
30.4
%
 
34.6
%
Expected dividend yield
1.03
%
 
0.63
%
Risk-free interest rate
2.31
%
 
3.00
%
Weighted-average fair value per option
$
14.40

 
$
16.40
Summary of Stock Options and Stock-Settled SARS Activity
A summary of stock options and stock-settled SARS activity for the six months ended June 30, 2015 is presented below:
Options and Stock-Settled SARS Activity:
Number of
Units
 
Weighted
Average
Exercise
Price Per
Unit
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2015
2,996,794

 
$
28.84

 
 
 
 
Granted
565,408

 
44.69

 
 
 
 
Exercised
(366,079
)
 
26.44

 
 
 
 
Forfeited
(13,838
)
 
43.22

 
 
 
 
Outstanding at June 30, 2015
3,182,285

 
$
31.88

 
6.5
 
$
91.2

Exercisable at June 30, 2015
2,066,881

 
$
25.72

 
5.2
 
$
72.0
Summary of Nonvested Stock and Nonvested Stock Units
A summary of nonvested stock and nonvested stock units for the six months ended June 30, 2015 is presented below:
Nonvested Stock and Nonvested Stock Units:
Number of
Units
 
Weighted 
Average
Grant Date
Fair Value
Per Unit
Nonvested at January 1, 2015
307,882

 
$
34.66

Granted
80,276

 
45.20

Vested
(118,492
)
 
25.71

Forfeited
(1,654
)
 
41.46

Nonvested at June 30, 2015
268,012

 
$
41.72