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Share-Based Compensation Level 1 (Notes)
 9 Months Ended
Sep. 30, 2013
Share-based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Share-Based Compensation
Stock Benefit Plans
We utilize the Black-Scholes option valuation model for estimating the fair value of our stock options. This model uses a range of assumptions related to volatility, the risk-free interest rate, the expected life, and the dividend yield. The fair values of our stock options are calculated using the following weighted average assumptions for the nine months ended September 30, 2013:
 
 
Nine Months Ended
Assumptions
 
September 30, 2013
Dividend yield
 
1.9
%
Expected volatility
 
35.2
%
Risk-free interest rate
 
0.7
%
Expected holding period (in years)
 
4.0


Stock Options
The following table sets forth stock option activity for the nine months ended September 30, 2013:
 
Options
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2012
12,401,970

 
$
8.84

Granted
2,041,330

 
$
15.26

Exercised
(573,335
)
 
$
8.89

Canceled
(36,397
)
 
$
10.31

Outstanding at September 30, 2013
13,833,568

 
$
9.78

Exercisable at September 30, 2013
9,719,085

 
$
8.50


As of September 30, 2013, the unrecognized compensation expense related to stock options of $9.7 million is expected to be recognized over a weighted average period of 1.4 years.
Restricted Shares
Restricted share activity for the nine months ended September 30, 2013 was as follows:
 
Restricted
shares
 
Weighted-Average
Grant-Date
Fair Value
Nonvested restricted shares at December 31, 2012
1,104,579

 
$
9.78

Granted
378,280

 
$
15.26

Vested
(296,886
)
 
$
8.63

Canceled
(2,744
)
 
$
10.32

Nonvested restricted shares at September 30, 2013
1,183,229

 
$
11.81


As of September 30, 2013, the unrecognized compensation expense related to restricted shares of $7.5 million is expected to be recognized over a weighted average period of 1.4 years.