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Share-based compensation plans (Tables)
 12 Months Ended
Dec. 31, 2011
Share-based compensation plans [Abstract]  
Expense for share-based compensation awards
The following amounts were recognized in our consolidated statements of income for share-based compensation awards:

   
2011
  
2010
  
2009
 
Stock options
 $3,633  $2,967  $3,213 
Restricted shares and restricted stock units
  1,799   2,866   3,135 
Employee stock purchase plan
  301   317   315 
Total share-based compensation expense
 $5,733  $6,150  $6,663 
Income tax benefit
 $(1,930) $(2,123) $(2,375)
Weighted-average assumptions used in the Black-Scholes option pricing model
The following weighted-average assumptions were used in the Black-Scholes option pricing model in determining the fair value of stock options granted:

   
2011
  
2010
  
2009
 
Risk-free interest rate (%)
  2.0   2.2   1.6 
Dividend yield (%)
  3.9   3.2   3.4 
Expected volatility (%)
  58.6   54.0   44.2 
Weighted-average option life (years)
  4.3   4.8   4.6 
Stock options rollforward
Information regarding options issued under the current and all previous plans was as follows:

(options in thousands)
 
 
Number of 
options
  
Weighted-
average exercise
price per option
  
Aggregate
intrinsic
 value
  
Weighted- average remaining contractual
term
(in years)
 
Outstanding at December 31, 2008
  3,105  $33.50       
Granted
  790   9.75       
Exercised
  (3)  9.73       
Forfeited or expired
  (1,051)  39.68       
Outstanding at December 31, 2009
  2,841   24.64       
Granted
  695   18.37       
Exercised
  (185)  11.08       
Forfeited or expired
  (438)  33.94       
Outstanding at December 31, 2010
  2,913   22.60       
Granted
  598   25.56       
Exercised
  (383)  16.56       
Forfeited or expired
  (362)  28.87       
Outstanding at December 31, 2011
  2,766   23.26  $7,519   3.7 
                  
Exercisable at December 31, 2009
  1,643  $30.60         
Exercisable at December 31, 2010
  1,675   27.66         
Exercisable at December 31, 2011
  1,685   25.18  $3,378   2.6 
Restricted stock units rollforward
Each restricted stock unit is convertible into one share of common stock upon completion of the vesting period. Information regarding our restricted stock units was as follows:
 
(units in thousands) 
Number of 
units
  
Weighted-
average grant
date fair value
per unit
  
Aggregate
 intrinsic
value
  
Weighted- average remaining contractual term
(in years)
 
Outstanding at December 31, 2008
  145  $26.65         
Granted
  17   12.27         
Vested
  (40)  24.04         
Forfeited
  (2)  25.57         
Outstanding at December 31, 2009
  120   25.48         
Granted
  34   19.85         
Vested
  (68)  25.57         
Outstanding at December 31, 2010
  86   23.58         
Granted
  26   24.70         
Vested
  (5)  16.84         
Forfeited
  (6)  20.61         
Outstanding at December 31, 2011
  101   24.26  $2,305   4.4 
Unvested restricted shares rollforward
Information regarding unvested restricted shares was as follows:

   
 
Number of shares
  
Weighted-
average grant
date fair value
per share
 
Unvested at December 31, 2008
  453  $25.53 
Granted
  44   14.81 
Vested
  (206)  25.19 
Forfeited
  (23)  25.82 
Unvested at December 31, 2009
  268   24.00 
Granted
  52   20.00 
Vested
  (131)  26.01 
Forfeited
  (7)  21.83 
Unvested at December 31, 2010
  182   21.48 
Granted
  25   26.58 
Vested
  (166)  21.72 
Forfeited
  (1)  18.14 
Unvested at December 31, 2011
  40   23.71