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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of options outstanding
The following table summarizes information about the options outstanding at December 31, 2012 (in thousands, except per share amounts and the weighted-average remaining contractual life):
Options Outstanding
 
Options Exercisable
Exercise Price
 
Outstanding 
 
Weighted-Avg.
Remaining
Contractual
        Life        
 
Weighted-Avg.
Exercise Price
 
Exercisable
 
Weighted-Avg.
Exercise Price
$7.48
 
10,000
 
0.1
 
$7.48
 
10,000
 
$7.48
$15.33 - $30.70
 
2,171,252
 
3.1
 
$17.24
 
1,038,523
 
$17.31
 
 
2,181,252
 
 
 
 
 
1,048,523
 
 
Assumptions used to determine fair value of options granted
The following weighted-average assumptions were used to determine the fair value of those options granted during 2012 and 2011, as there were no options granted during 2010:
 
For Years Ended
 
December 31,
 
2012
2011
Expected volatility(1)
34.1%
39.0%
Expected dividends
—%
—%
Expected term(2)
4.4 years
4.3 years
Risk-free rate(3)
0.62%
0.79%
 
(1) 
We estimated the volatility of our common stock on the date of grant based on both historical and implied volatility.
(2) 
The expected term represents the period of time that we expect options to be outstanding. We estimated the expected term based upon the weighted-average of our historical experience.
(3) 
The risk-free interest rate is based on the implied yield in effect at the time of option grant on U.S. Treasury zero-coupon issues with equivalent remaining terms.
Summary of nonvested stock activity
A summary of our non-vested stock activity for 2012 is as follows (in thousands, except weighted-average fair value per share:
 
 
Shares
 
Grant Date
Weighted-
Average Fair
Value Per Share
Outstanding at December 31, 2010
 
687

 
$
26.16

Granted
 
1,248

 
$
19.99

Vested
 
(336
)
 
$
28.81

Forfeited/Canceled
 
(83
)
 
$
21.33

Outstanding at December 31, 2011
 
1,516

 
$
20.76

Granted
 
400

 
$
19.23

Vested
 
(457
)
 
$
22.17

Forfeited/Canceled
 
(8
)
 
$
19.03

Outstanding at December 31, 2012
 
1,451

 
$
19.90
Summary of stock option activity
Stock Option Activity
A summary of our stock option activity for 2012 is as follows (in thousands, except weighted-average exercise price and weighted-average remaining contractual term):
 
 
Stock
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2010
 
3,323

 
$
16.45

 
 
 
 
Granted
 
894

 
$
15.98

 
 
 
 
Exercised
 
(395
)
 
$
10.12

 
 
 
 
Forfeited/Canceled
 
(46
)
 
$
23.25

 
 
 
 
Outstanding at December 31, 2011
 
3,776

 
$
16.92

 
2.3
 
$
10,699

Granted
 
462

 
$
18.94

 
 
 
 
Exercised
 
(966
)
 
$
9.87

 
 
 
 
Expired
 
(1,039
)
 
$
23.68

 
 
 
 
Forfeited/Canceled
 
(52
)
 
$
18.91

 
 
 
 
Outstanding at December 31, 2012
 
2,181

 
$
17.20

 
3.1
 
$
8,399

Exercisable at December 31, 2012
 
1,049

 
$
17.21

 
1.4
 
$
4,025

Vested and expected to vest at December 31, 2012.
 
2,151

 
$
17.22

 
3.1
 
$
8,246