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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair values of our stock options are calculated using the following weighted average assumptions for the three months ended March 31, 2016:
Dividend yield
1.9
%
Expected volatility
19.5
%
Risk-free interest rate
1.0
%
Expected holding period (in years)
4.0
Schedule of Share-based Compensation, Stock Options, Activity
The following table sets forth stock option activity for the three months ended March 31, 2016:
 
Options
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2015
11,047,920

 
$
13.98

Granted
1,036,522

 
$
22.28

Exercised
(417,383
)
 
$
7.51

Canceled
(7,064
)
 
$
20.97

Outstanding at March 31, 2016
11,659,995

 
$
14.94

Exercisable at March 31, 2016
8,559,885

 
$
12.62
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
Restricted share activity for the three months ended March 31, 2016 was as follows:
 
Restricted
Shares
 
Weighted-Average
Grant-Date
Fair Value
Nonvested restricted shares at December 31, 2015
573,739

 
$
19.32

Granted
241,510

 
$
22.28

Vested
(306,000
)
 
$
18.06

Forfeited
(1,258
)
 
$
20.85

Nonvested restricted shares at March 31, 2016
507,991

 
$
21.48