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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Units
A summary of our time-based RSU activity from January 1, 2013 through March 31, 2013 is presented below:
 
Nonvested RSUs
 
Vested RSUs
 
Total RSUs
 
Amount
 
Weighted-Average
Grant Date  Fair Value Per Share
 
Outstanding at January 1, 2013
279,102

 
$
41.30

 
769,761

 
1,048,863

Granted
157,232

 
48.88

 
—

 
157,232

Vested
(64,778
)
 
37.89

 
64,778

 
—

Settled (1)
 
 
 
 
(8,559
)
 
(8,559
)
Issuance of dividend equivalents (2)
 
 
 
 
6,864

 
6,864

Canceled (1)(3)
 
 
 
 
(3,800
)
 
(3,800
)
Outstanding as of March 31, 2013
371,556

 
$
45.11

 
829,044

 
1,200,600

________________________
(1)
Represents vested RSUs that are settled in cash or shares of the Company's common stock.
(2)
RSUs issued as dividend equivalents are vested upon issuance.
(3)
We accept the return of RSUs, at the current quoted closing share price of the Company's common stock, to satisfy minimum statutory tax-withholding requirements related to either the issuance, vesting or settlement of RSUs in accordance with the terms of the 2006 Plan.
Summary of Nonvested and Vested Restricted Stock Units
A summary of our time-based RSU activity for the three months ended March 31, 2013 and 2012 is presented below:
 
RSUs Granted
 
RSUs Vested
Three Months Ended March 31,
Non-Vested RSUs Issued
 
Weighted-Average Grant Date Fair Value Per Share
 
Vested RSUs
 
Total Vest-Date Fair Value (1)            (in thousands)
2013
157,232

 
$
48.88

 
(64,778
)
 
$
3,161

2012
196,033

 
44.29

 
(48,864
)
 
1,961

_______________________
(1)
Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.
Summary of nonvested shares
A summary of our nonvested shares activity from January 1, 2013 through March 31, 2013 is presented below:
Nonvested Shares
Shares
 
Weighted-Average
Grant Date
Fair Value Per Share
Outstanding at January 1, 2013
95,241

 
$
40.42

Granted
—

 
—

Vested (1)
(47,291
)
 
39.12

Outstanding as of March 31, 2013
47,950

 
$
41.71

________________________
(1)
The total shares vested include 20,880 shares that were tendered in accordance with the terms of the 2006 Plan to satisfy minimum statutory tax withholding requirements related to the restricted shares that have vested. We accept the return of shares at the current quoted closing share price of the Company's common stock to satisfy tax obligations.
Summary of nonvested and vested shares
A summary of our nonvested and vested share activity for the three months ended March 31, 2013 and 2012 is presented below:
 
Shares Granted
 
Shares Vested
Three Months Ended March 31,
Non-Vested Shares Issued
 
Weighted-Average Grant Date Fair Value Per Share
 
Vested Shares
 
Total Fair Value at Vest Date(1)          (in thousands)
2013
—

 
$
—

 
(47,291
)
 
$
2,290

2012
59,938

 
41.71

 
(33,104
)
 
1,274

_______________________
(1)
Total fair value of shares vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the date of vesting.
Schedule of Share-based Compensation, Stock Options, Activity
A summary of our stock option activity from January 1, 2013 through March 31, 2013 is presented below:
 
Number of Options
 
Exercise Price
 
Remaining Contractual Term (years)
Outstanding at January 1, 2013
1,540,000

 
$42.61
 
 
Granted
—

 
—
 
 
Exercised
—

 
—
 
 
Forfeited
(12,000
)
 
42.61
 
 
Outstanding at March 31, 2013 (1)(2)
1,528,000

 
$42.61
 
8.9
________________________
(1)
As of March 31, 2013, 308,000 of the outstanding stock options were exercisable.
(2)
The total intrinsic value of options outstanding at March 31, 2013 was $15.0 million