v2.4.0.8
Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Activity [Table Text Block]
A summary of our performance share unit activity for the three months ended March 31, 2014, is as follows:
 
Number of
Performance Share Units
 
Weighted
Average
Grant-Date
Fair Value
Nonvested — December 31, 2013
449,798

 
$
21.25

Granted
461,393

 
$
22.56

Forfeited
—

 
$
—

Vested
15,312

(1) 
$
21.25

Nonvested — March 31, 2014
895,879

 
$
21.92


___________
(1)
In accordance with the applicable performance share unit agreements, performance share units granted to employees who meet the retirement eligibility requirements stipulated in the Equity Plan are fully vested upon the later of the date on which the employee becomes eligible to retire or one-year anniversary of the grant date.
Schedule of Non-Qualified Stock Option Activity
A summary of all of our non-qualified stock option activity for the three months ended March 31, 2014, is as follows:
 
Number of
Shares
 
Weighted Average
Exercise Price
 
Weighted
Average
Remaining
Term
(in years)
 
Aggregate
Intrinsic Value
(in millions)
Outstanding — December 31, 2013
14,114,289

 
$
18.25

 
3.1
 
$
36

Granted
—

 
$
—

 
 
 
 
Exercised
184,931

 
$
15.56

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Expired
1,500

 
$
17.39

 
 
 
 
Outstanding — March 31, 2014
13,927,858

 
$
18.29

 
2.8
 
$
48

Exercisable — March 31, 2014
13,012,308

 
$
18.50

 
2.5
 
$
43

Vested and expected to vest – March 31, 2014
13,871,693

 
$
18.30

 
2.8
 
$
48
Schedule of Assumptions Used to Estimate Fair Value for Options
Certain assumptions were used in order to estimate fair value for options as noted in the following table:
 
2013
Expected term (in years)(1)
6.5

 
Risk-free interest rate(2)
1.4

%
Expected volatility(3)
25.6

%
Dividend yield(4)
—

 
Weighted average grant-date fair value (per option)
$
5.31

 
___________
(1)
Expected term calculated using the simplified method prescribed by the SEC due to the lack of sufficient historical exercise data on the grant date to provide a reasonable basis to estimate the expected term.
(2)
Zero Coupon U.S. Treasury rate or equivalent based on expected term.
(3)
Volatility calculated using the implied volatility of our exchange traded stock options.
(4)
We have never paid cash dividends on our common stock, and we do not anticipate any cash dividend payments on our common stock in the near future.
Schedule of Restricted Stock and Restricted Stock Unit Activity
A summary of our restricted stock and restricted stock unit activity for the three months ended March 31, 2014, is as follows:
 
Number of
Restricted
Stock Awards
 
Weighted
Average
Grant-Date
Fair Value
Nonvested — December 31, 2013
4,431,841

 
$
16.45

Granted
1,764,446

 
$
19.11

Forfeited
25,977

 
$
17.03

Vested
1,434,614

 
$
15.07

Nonvested — March 31, 2014
4,735,696

 
$
17.86