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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]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of our stock option activity from January 1, 2012 through December 31, 2012 is presented below:
 
Number of Options
 
Exercise Price
 
Remaining Contractual Term (years)
Outstanding at January 1, 2012 (1)
5,000

 
$25.77
 
 
Granted
1,550,000

 
42.61
 
 
Exercised (1)
(5,000
)
 
25.77
 
 
Forfeited
(10,000
)
 
42.61
 
 
Outstanding at December 31, 2012 (2)(3)
1,540,000

 
$42.61
 
9.2
________________________
(1)
Stock options outstanding as of December 31, 2011 were granted in 2002 and exercised in 2012 prior to expiration. No stock options were granted during 2003 through 2011.
(2)
As of December 31, 2012, none of the outstanding stock options were exercisable.
(3)
The total intrinsic value of options outstanding at December 31, 2012 was $7.3 million.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on the following assumptions for the February 2012 grant.
 
February 2012 Option Grant
 
Fair value of options granted per share
$9.20
 
Expected stock price volatility
33.00%
 
Risk-free interest rate
1.35%
 
Dividend yield
3.80%
 
Expected life of option
6.5 years
 
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]
 
March 2012 Market Measure-based RSU Grant
 
Grant date fair value per share
$41.20
 
Expected share price volatility
31.00%
 
Risk-free interest rate
1.60%
 
Dividend yield
3.80%
 
Expected life
7 years
 
Summary of Restricted Stock Units
A summary of our time-based RSU activity from January 1, 2012 through December 31, 2012 is presented below:
 
Nonvested RSUs
 
 
 
 
Nonvested and Vested Restricted Stock Units
Amount
 
Weighted-Average
Grant Date
Fair Value
 
Vested RSUs
 
Total RSUs
Outstanding at January 1, 2012
147,961

 
$
32.18

 
694,714

 
842,675

Granted (1)
204,829

 
44.34

 
—

 
204,829

Vested
(73,688
)
 
38.91

 
73,688

 
—

Settled (2)
 
 
 
 
(19,955
)
 
(19,955
)
Issuance of dividend equivalents (3)
 
 
 
 
28,368

 
28,368

Canceled (2) (4)
 
 
 
 
(7,054
)
 
(7,054
)
Outstanding as of December 31, 2012
279,102

 
$
41.30

 
769,761

 
1,048,863

 _______________________
(1)
Includes 103,239 RSUs issued to the Company's Chief Executive Officer, as described above.
(2)
In August 2012 and December 2012, certain vested RSUs were settled in shares of the Company's common stock.
(3)
RSUs issued as dividend equivalents are vested upon issuance.
(4)
We accept the return of RSUs, at the current quoted market price of the Company's common stock, to satisfy minimum statutory tax-withholding requirements related to either RSUs that have vested or RSU dividend equivalents 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 years ended December 31, 2012, 2011, and 2010 is presented below:

 
RSUs Granted
 
RSUs Vested
Year Ended
Non-Vested RSUs Issued
 
Weighted- Average Grant-Date Fair Value
 
Vested RSUs
 
Total Vest-Date Fair Value (1)            (in thousands)
2012
204,829

 
$
44.34

 
(73,688
)
 
$
3,118

2011
107,673

 
37.94

 
(85,466
)
 
3,273

2010
159,606

 
30.24

 
(303,146
)
 
10,936

________________________
(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, 2012 through December 31, 2012 is presented below:
Nonvested Shares
Shares
 
Weighted-Average
Grant-Date
Fair Value
Outstanding at January 1, 2012
83,966

 
$
39.83

Granted
62,137

 
41.84

Vested (1)
(50,862
)
 
41.29

Outstanding as of December 31, 2012
95,241

 
$
40.42

_______________
(1)
The total shares vested include 18,766 of shares that were then tendered to satisfy minimum statutory tax withholding requirements related to the restricted shares that have vested in accordance with the terms of the 2006 Plan. We accept the return of shares at the current quoted market price of the Company's common stock to satisfy tax obligations.
Summary of nonvested and vested shares
A summary of our nonvested and vested shares activity for the years ended December 31, 2012, 2011, and 2010 is presented below:
 
Shares Granted
 
Shares Vested
Year Ended
Non-Vested Shares Issued
 
Weighted- Average Grant-Date Fair Value
 
Vested Shares
 
Total Vest-Date Fair Value (1)          (in thousands)
2012
62,137

 
$
41.84

 
(50,862
)
 
$
2,110

2011
68,727

 
37.83

 
(34,793
)
 
1,334

2010
3,239

 
30.88

 
(41,680
)
 
1,398

_______________________
(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 day of vesting.