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Share-Based Compensation and Equity (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The following table summarizes the components of the Company’s employee and non-employee share-based compensation programs recognized as selling and administrative expense for the years ended December 31:
 
 
2012
 
2011
 
2010
Stock options:
 
 
 
 
 
 
     Pre-tax compensation expense
 
$
2,572

 
$
3,486

 
$
3,540

     Tax benefit
 
(825
)
 
(1,238
)
 
(1,310
)
Stock option expense, net of tax
 
$
1,747

 
$
2,248

 
$
2,230

 
 
 
 
 
 
 
Restricted Stock Units:
 
 
 
 
 
 
     Pre-tax compensation expense
 
$
5,741

 
$
5,734

 
$
4,355

     Tax benefit
 
(1,809
)
 
(1,845
)
 
(1,611
)
RSU expense, net of tax
 
$
3,932

 
$
3,889

 
$
2,744

 
 
 
 
 
 
 
Performance shares:
 
 
 
 
 
 
     Pre-tax compensation expense
 
$
4,425

 
$
4,076

 
$
3,820

     Tax benefit
 
(1,602
)
 
(1,459
)
 
(1,413
)
Performance share expense, net of tax
 
$
2,823

 
$
2,617

 
$
2,407

 
 
 
 
 
 
 
Deferred shares:
 
 
 
 
 
 
     Pre-tax compensation expense
 
$
1,102

 
$
1,000

 
$
826

     Tax benefit
 
(408
)
 
(370
)
 
(306
)
Deferred share expense, net of tax
 
$
694

 
$
630

 
$
520

 
 
 
 
 
 
 
 Total share-based compensation:
 
 
 
 
 
 
     Pre-tax compensation expense
 
$
13,840

 
$
14,296

 
$
12,541

     Tax benefit
 
(4,644
)
 
(4,912
)
 
(4,640
)
 Total share-based compensation, net of tax
 
$
9,196

 
$
9,384

 
$
7,901
Schedule of Unrecognized Compensation Cost, Nonvested Awards

The following table summarizes information related to unrecognized share-based compensation costs as of December 31, 2012:
 
 
Unrecognized
Cost
 
Weighted-Average Period
 
 
 
 
(years)
Stock options
 
$
7,764

 
2.6
RSUs
 
10,752

 
1.8
Performance shares
 
5,986

 
1.2
Deferred shares
 
259

 
0.3
 
 
$
24,761

 
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The estimated fair value of the options granted was calculated using a Black-Scholes option pricing model using the following assumptions:
 
2012
 
2011
 
2010
Expected life (in years)
6-7

 
6-7

 
6-7

Weighted-average volatility
41
%
 
40
%
 
40
%
Risk-free interest rate
0.83 - 1.39%

 
1.15 - 3.05%

 
2.77 - 3.15%

Expected dividend yield
3.08 - 3.23%

 
2.74 - 2.97%

 
2.44 - 2.63%
Options outstanding and exercisable under the Company's 1991 Equity and Performance Incentive Plan
Options outstanding and exercisable as of December 31, 2012 and changes during the year ended were as follows:
 
Number of Shares
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
 
Aggregate Intrinsic Value (1)
 
(in thousands)
 
(per share)
 
(in years)
 
 
Outstanding at January 1, 2012
3,201

 
$
36.70

 
 
 
 
Expired or forfeited
(555
)
 
37.33

 
 
 
 
Exercised
(554
)
 
30.11

 
 
 
 
Granted
576

 
34.98

 
 
 
 
Outstanding at December 31, 2012
2,668

 
37.56

 
5
 
$
2,617

Options exercisable at December 31, 2012
1,572

 
40.96

 
3
 
1,703

Options vested and expected to vest (2) at
December 31, 2012
2,638

 
37.62

 
5
 
2,589


(1)
The aggregate intrinsic value represents the total pre-tax intrinsic value (the difference between the Company’s closing share price on the last trading day of the year in 2012 and the exercise price, multiplied by the number of “in-the-money” options) that would have been received by the option holders had all option holders exercised their options on December 31, 2012. The amount of aggregate intrinsic value will change based on the fair market value of the Company’s common shares.
(2)
The expected to vest options are the result of applying the pre-vesting forfeiture rate assumption to total outstanding non-vested options.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Non-vested RSUs outstanding as of December 31, 2012 and changes during the year ended were as follows:
 
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Value
 
 
(in thousands)
 
 
Non-vested at January 1, 2012
 
717

 
$
30.69

Forfeited
 
(71
)
 
31.19

Vested
 
(165
)
 
25.53

Granted
 
251

 
35.16

Non-vested at December 31, 2012
 
732

 
33.33
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
Non-vested performance shares outstanding as of December 31, 2012 and changes during the year ended were as follows:
 
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Value
 
 
(in thousands)
 
 
Non-vested at January 1, 2012
 
727

 
$
34.70

Forfeited
 
(215
)
 
30.99

Vested
 
(86
)
 
29.25

Granted
 
303

 
44.25

Non-vested at December 31, 2012
 
729

 
40.41
Schedule of Nonvested and outstanding deferred shares activity
Non-vested deferred shares as of December 31, 2012 and changes during the year ended were as follows:
 
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Value
 
 
(in thousands)
 
 
Non-vested at January 1, 2012
 
19

 
$
33.98

Vested
 
(27
)
 
36.05

Granted
 
28

 
40.54

Non-vested at December 31, 2012
 
20

 
40.54

Vested at December 31, 2012
 
116

 
34.36

Outstanding at December 31, 2012
 
136

 
35.27