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Stock Options and Other Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Stock Options and Other Stock Based Compensation  
Summary of option activity

                                                                                                                                                                                  

 

 

Number of
Shares
(thousands)

 

Weighted
Average
Exercise
Price
(per share)

 

Weighted
Average
Remaining
Contractual
Term
(years)

 

Aggregate
Intrinsic
Value

 

Options outstanding at January 1, 2014

 

 

2,421

 

$

25.50

 

 

 

 

 

 

 

Granted

 

 

346

 

 

33.38

 

 

 

 

 

 

 

Exercised

 

 

(231

)

 

21.43

 

 

 

 

 

 

 

Forfeited or expired

 

 

(115

)

 

29.43

 

 

 

 

 

 

 

​  

​  

Options outstanding at December 31, 2014

 

 

2,421

 

 

26.83

 

 

3.1

 

$

12

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

Options vested or expected to vest at December 31, 2014

 

 

2,389

 

$

26.80

 

 

3.0

 

$

12

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

Options exercisable at December 31, 2014

 

 

1,595

 

$

24.14

 

 

2.0

 

$

11

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

 

Additional information related to stock options

                                                                                                                                                                                    

 

 

2014

 

2013

 

2012

 

Weighted average grant-date fair value of options granted (per share)

 

$

13.17 

 

$

12.39 

 

$

10.63 

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

Aggregate intrinsic value of options exercised

 

$

 

$

16 

 

$

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

Aggregate cash received from options exercised

 

$

 

$

24 

 

$

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

 

Schedule of weighted average assumptions used to estimate the fair value of each option grant on the date of grant using the Black-Scholes option pricing model

                                                                                                                                                                                    

 

 

2014

 

2013

 

2012

 

Expected life of options (years)

 

 

5.00 

 

 

5.00 

 

 

4.75 

 

Expected stock price volatility

 

 

43.0 

%

 

55.3 

%

 

56.6 

%

Risk-free interest rate

 

 

1.6 

%

 

0.9 

%

 

0.8 

%

Expected dividend yield

 

 

0.0 

%

 

0.0 

%

 

0.0 

%

 

Restricted shares and restricted share units activity

                                                                                                                                                                     

 

 

Number of
Restricted
Shares
(thousands)

 

Weighted
Average
Grant-Date
Fair Value
(per share)

 

Nonvested at January 1, 2014

 

 

457

 

$

24.14

 

Granted

 

 

213

 

 

33.36

 

Vested

 

 

(153

)

 

26.45

 

Forfeited

 

 

(30

)

 

27.39

 

​  

​  

Nonvested at December 31, 2014

 

 

487

 

 

27.25

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

Awards granted during 2013

 

 

 

 

$

26.49

 

Awards granted during 2012

 

 

 

 

$

22.39

 

 

                                                                                                                                                                                    

 

 

2014

 

2013

 

2012

 

Total fair value of shares vested

 

$

 

$

 

$

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

 

Performance vested restricted share unit activity

                                                                                                                                                                                    

 

 

Number of
Performance
Vested Restricted
Shares Units
(thousands)

 

Weighted Average
Grant-Date Fair
Value (per unit)

 

Nonvested at January 1, 2014

 

 

882

 

$

25.49

 

Granted

 

 

273

 

 

33.41

 

Vested

 

 

(56

)

 

29.67

 

Forfeited/Cancelled

 

 

(196

)

 

28.64

 

​  

​  

Nonvested at December 31, 2014

 

 

903

 

 

26.94

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

Awards granted during 2013

 

 

 

 

$

26.10

 

Awards granted during 2012

 

 

 

 

$

22.50