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Stock-Based Incentive Plans (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
9 Months Ended1 Months Ended9 Months Ended1 Months Ended
Sep. 30, 2011
Y
segment
plan
lawsuit
Sep. 30, 2010
Feb. 28, 2011
1994 Plan
Y
Feb. 28, 2010
1994 Plan
Y
Sep. 30, 2011
1994 Plan
Y
Feb. 02, 2010
1994 Plan
Feb. 28, 2011
1995 Plan
Y
Feb. 15, 2011
1995 Plan
Stock-Based Incentive Plans        
Number of stock-based incentive plans1       
Number of stock option plans superseded2       
Black-Scholes option pricing model assumptions for options granted        
Number of Options Granted (in shares)1,392 1,362148  30 
Risk Free Interest Rate (as a percent)  2.62%2.93%  2.92% 
Dividend Yield (as a percent)  1.75%1.62%  1.76% 
Expected Life (in years)  6.26.5  6.6 
Volatility (as a percent)  39.00%36.00%  38.00% 
Exercise price for options granted, low end of range (in dollars per share)  $ 29.66     
Exercise price for options granted, high end of range (in dollars per share)  $ 32.63     
Exercise Price (in dollars per share)     $ 24.75 $ 29.58
Weighted Average Fair Value (in dollars per share)  $ 10.33$ 8.46  $ 10.49 
Non-Qualified Stock Options activity        
Outstanding at the beginning of the period (in shares)1,124       
Granted (in shares)1,392 1,362148  30 
Exercised (in shares)(7)       
Forfeited (in shares)(20)       
Outstanding at the end of the period (in shares)2,489       
Outstanding and expected to vest at the end of the period (in shares)2,437       
Exercisable at the end of the period (in shares)1,165       
Weighted-Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)$ 34.19       
Granted (in dollars per share)$ 29.66       
Exercised (in dollars per share)$ 23.74       
Forfeited (in dollars per share)$ 35.69       
Outstanding at the end of the period (in dollars per share)$ 31.68       
Outstanding and expected to vest at end of the period (in dollars per share)$ 31.74       
Exercisable at end of the period (in dollars per share)$ 34.58       
Weighted-Average Remaining Contractual Life        
Outstanding at the end of the period (in years)4.3       
Outstanding and expected to vest at end of the period (in years)4.3       
Exercisable at end of the period (in years)2.2       
Aggregate Intrinsic Value        
Outstanding at the end of the period (in dollars)$ 370,000       
Outstanding and expected to vest at end of the period (in dollars)360,000       
Exercisable at end of the period (in dollars)233,000       
Closing price of share (in dollars per share)$ 24.93       
Total intrinsic value of options exercised (in dollars)40,000300,000      
Number of shares, unvested options        
Unvested at the beginning of the period (in shares)180       
Granted (in shares)1,392       
Vested (in shares)(242)       
Forfeited (in shares)(5)       
Unvested at the end of the period (in shares)1,325       
Weighted-Average Grant-Date Fair Value, unvested stock options        
Unvested at the beginning of the period (in dollars per share)$ 7.85       
Granted (in dollars per share)$ 10.33       
Vested (in dollars per share)$ 9.86       
Forfeited (in dollars per share)$ 9.25       
Unvested at the end of the period (in dollars per share)$ 10.09       
Unrecognized compensation cost        
Unrecognized compensation costs related to unvested share-based compensation arrangements (in dollars)    $ 17,400,000   
Weighted-average period for recognition of unrecognized stock-based compensation expense (in years)    3.5