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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Share Based Compensation [Abstract]  
Schedule of Stock Option Activity

Stock option awards as of December 31, 2015 and March 31, 2016, and changes during the three months ended March 31, 2016, were as follows:

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

Remaining

 

 

Aggregate

 

 

 

 

 

 

Average

 

 

Contractual

 

 

Intrinsic

 

 

Shares Under Option

 

 

Exercise

 

 

Term

 

 

Value

 

 

(thousands)

 

 

Price

 

 

(years)

 

 

(millions)

 

Outstanding at December 31, 2015

 

3,707

 

 

$

19.66

 

 

 

3.6

 

 

$

8.4

 

Exercised

 

(22

)

 

 

13.23

 

 

 

 

 

 

 

 

 

Cancelled/forfeited/expired

 

(1

)

 

 

13.23

 

 

 

 

 

 

 

 

 

Outstanding at March 31, 2016

 

3,684

 

 

 

19.70

 

 

 

3.4

 

 

 

11.3

 

Vested and expected to vest at March 31, 2016

 

3,684

 

 

 

19.70

 

 

 

3.4

 

 

 

11.3

 

Exercisable at March 31, 2016

 

1,720

 

 

$

9.84

 

 

 

4.3

 

 

$

11.3

 

 
Nonvested Restricted Stock Unit Awards

Nonvested restricted stock unit awards as of December 31, 2015 and March 31, 2016, and changes during the three months ended March 31, 2016, were as follows:

 

 

Shares

 

 

Grant Date

 

 

(Thousands)

 

 

Fair Value

 

Nonvested at December 31, 2015

 

1,670

 

 

$

13.72

 

Granted

 

1,257

 

 

 

12.88

 

Vested

 

(570

)

 

 

11.40

 

Nonvested at March 31, 2016

 

2,357

 

 

$

13.82