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Common Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Share-based Compensation [Abstract]  
Schedule of performance share award activity
No performance share awards were granted in 2011, 2010 or 2009. A summary of performance share award activity is presented below:

 
Stock Incentive Plan



                       Shares
Weighted
Average Price
Nonvested at December 31, 2008
228,683

$
30.80

Expired without payout
(117,540
)
18.50

Nonvested at December 31, 2009
111,143

43.81

Vested and paid
(111,143
)
43.81

Nonvested at December 31, 2010
—

$
—
Schedule of stock option activity and transactions
A summary of stock option activity as of December 31, 2011, and transactions during the years ended December 31, 2011, 2010 and 2009 are presented below:

 
Stock Incentive Plan



Shares
Weighted Average Exercise Price
Outstanding at December 31, 2008
620,517

$
40.75

Granted
543,242

29.91

Exercised
(55,950
)
13.10

Outstanding at December 31, 2009
1,107,809

36.83

Granted
281,110

46.69

Exercised
(111,676
)
23.83

Forfeited
(1,200
)
13.72

Outstanding at December 31, 2010
1,276,043

40.16

Granted
293,978

54.99

Exercised
(227,405
)
32.33

Forfeited
(4,375
)
35.35

Outstanding at December 31, 2011
1,338,241

$
44.77

Exercisable at December 31, 2009
360,229

$
36.87

Exercisable at December 31, 2010
574,992

$
41.16

Exercisable at December 31, 2011
677,753

$
43.72

Remaining reserved for issuance at December 31, 2011
3,798,701

—
Schedule of stock options valuation assumptions
The Company uses the Black-Scholes pricing model to calculate the fair values of the options awarded. For purposes of this valuation the following assumptions were used to derive the fair values:

Grant date
1/26/2011
1/27/2010
8/24/2009
1/28/2009
Awards granted
293,978

281,110

4,750

538,492

Fair market value of stock at grant
$19.65
$16.47
$15.00
$8.83
Expected life of award
5.8 years

5.7 years

5.7 years

5.7 years

Risk-free interest rate
2.45
%
2.76
%
2.80
%
1.89
%
Annualized volatility rate
37.8
%
37.3
%
36.9
%
34.8
%
Dividend yield
1.0
%
1.1
%
1.2
%
1.7
%
Schedule of outstanding stock options by range of exercise prices
The following table summarizes options outstanding as of December 31, 2011:

Stock Incentive Plan

Range of Exercise Prices

Shares
Weighted Average Remaining Contractual Life
$14.86
37,250
1.08 years
$21.38
8,460
2.08 years
$46.45
154,920
5.00 years
$55.08
7,260
5.50 years
$60.56
184,565
6.00 years
$29.79
365,948
7.00 years
$43.30
4,750
7.67 years
$46.69
281,110
8.00 years
$54.99
293,978
9.00 years
$14.86-$60.56
1,338,241
7.08 years
Schedule of restricted stock activity and transactions
A summary of restricted stock activity as of December 31, 2011, and transactions during the years ended December 31, 2011, 2010 and 2009 is presented below:

 
Stock Incentive Plan
 

Shares
Weighted Average Price
Nonvested at December 31, 2008
111,355

$
31.49

Granted
6,150

43.30

Vested
(64,500
)
31.65

Nonvested at December 31, 2009
53,005

32.66

Vested
(28,855
)
30.30

Nonvested at December 31, 2010
24,150

35.49

Vested
(14,875
)
30.81

Nonvested at December 31, 2011
9,275

$
42.99
Schedule of stock appreciation rights valuation assumptions
For purposes of this valuation the following assumptions were used to derive the fair values as of December 31, 2011:

Grant date
1/26/2011
1/27/2010
2/13-16/2009
1/28/2009
Awards granted
189,984
171,749
3,292
305,257
Fair market value of award
$15.43
$16.43
$21.98
$22.93
Expected life of award
5.6 years
4.6 years
3.6 years
3.6 years
Risk-free interest rate
1.05%
0.77%
0.53%
0.53%
Annualized volatility rate
39.5%
39.5%
39.5%
39.5%
Dividend yield
1.1%
1.1%
1.1%
1.1%