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Common Stock and Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Reconciliation of the changes in the number of shares of common stock issued
A reconciliation of the changes in the number of common shares issued is as follows:
(Thousands)
 
Issued as of January 1, 2010
26,800

Exercise of stock options and SARs
162

Vesting of performance-restricted shares
6

 
 
Issued as of December 31, 2010
26,968

Exercise of stock options and SARs
55

Vesting of performance-restricted shares
1

 
 
Issued as of December 31, 2011
27,024

Exercise of stock options and SARs
26

 
 
Issued as of December 31, 2012
27,050

 
 
Summary of company's stock option activity
The following table summarizes the Company’s stock option activity during 2012:
(Shares in thousands)
 
Number of
Options
 
Weighted-
average
Exercise
Price Per
Share
 
Aggregate
Intrinsic
Value
 
Weighted-
average
Remaining
Term (Years)
Outstanding at December 31, 2011
 
113

 
$
15.03

 
 
 
 
Exercised
 
(16
)
 
9.75

 
 
 
 
Canceled
 
(1
)
 
7.27

 
 
 
 
Outstanding at December 31, 2012
 
96

 
15.98

 
$
943,000

 
1.4
Vested and expected to vest as of December 31, 2012
 
96

 
15.98

 
943,000

 
1.4
Exercisable at December 31, 2012
 
96

 
15.98

 
943,000

 
1.4
Summary of options outstanding
Summarized information on options outstanding as of December 31, 2012 is as follows:
 
 
Number
Outstanding
and Exercisable
(Thousands)
 
Weighted-
average
Remaining
Life (Years)
 
Weighted-
average
Exercise
Price
Range of Option Prices
 
 
 
 
 
 
$5.55 - $8.10
 
11

 
0.4
 
$
6.75

$14.80-$16.10
 
8

 
1.8
 
15.45

$17.075-$17.58
 
77

 
1.5
 
17.31

 
 
96

 
1.4
 
$
15.98

Summary of restricted stock activity
The following table summarizes the restricted stock activity during 2012:
(Shares in thousands)
 
Number of
Shares
 
Weighted-
average
Grant Date
Fair Value
Outstanding at December 31, 2011
 
311

 
$
23.89

Granted
 
76

 
27.87

Vested
 
(113
)
 
28.37

Forfeited
 
(51
)
 
28.93

Outstanding at December 31, 2012
 
223

 
$
30.18

Summary of stock activity for the directors deferred compensation plan
The following table summarizes the stock activity for the directors' deferred compensation plan during 2012:
(Shares in thousands)
 
Number of
Shares
 
Weighted-
average
Grant  Date
Fair Value
Outstanding at December 31, 2011
 
101

 
$
26.42

Granted
 
8

 
23.10

Distributed
 
(6
)
 
(26.40
)
Outstanding at December 31, 2012
 
103

 
$
38.68

Summary of Company's SARs activity
The following table summarizes the Company's SARs activity during 2012:
(Shares in thousands)
 
Number of
SARs
 
Weighted-
average
Exercise
Price Per
Share
 
Aggregate
Intrinsic
Value
 
Weighted-
average
Remaining
Term (Years)
Outstanding at December 31, 2011
 
841

 
$
23.39

 
 
 
 
Granted
 
185

 
29.45

 
 
 
 
Exercised
 
(33
)
 
15.01

 
 
 
 
Outstanding at December 31, 2012
 
993

 
24.80

 
$
4,473,000

 
5.9
Vested and expected to vest as of December 31, 2012
 
993

 
24.80

 
4,473,000

 
5.9
Exercisable at December 31, 2012
 
444

 
19.65

 
3,511,000

 
5.5
Summary of information on SARs outstanding
Summarized information on SARs outstanding as of December 31, 2012 follows:
SARs Prices
 
Number
Outstanding
(Thousands)
 
Weighted-
average
Remaining
Life (Years)
 
Weighted-
average
Exercise
Price
$15.01
316

 
6.1
 
$
15.01

$21.24-$24.03
272

 
6.2
 
21.86

$27.78-$29.45
214

 
5.3
 
29.23

$34.30-$39.30
152

 
5.3
 
39.19

$44.72
39

 
4.1
 
44.72

 
 
993

 
5.9
 
$
24.80

Fair value of SARs using Black-Scholes pricing model
The fair value of the SARs was estimated on the grant date using the Black-Scholes pricing model with the following assumptions:
 
 
2012
 
2011
 
2010
Risk-free interest rate
 
0.89
%
 
0.03
%
 
0.11
%
Dividend yield
 
%
 
%
 
%
Volatility
 
50.0
%
 
58.7
%
 
58.0
%
Expected lives (in years)
 
5.0

 
6.5

 
6.5