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Stock-Based Incentive Plans (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
plan
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2012
1994 Plan
Granted on 3 Feb 2011
Sep. 30, 2012
1994 Plan
Granted on 3 Feb 2011
Minimum
Sep. 30, 2012
1994 Plan
Granted on 3 Feb 2011
Maximum
Sep. 30, 2012
1995 Plan
Granted on 15 Feb 2011
Jan. 31, 2012
Restricted Stock Units
Sep. 30, 2012
Restricted Stock Units
Sep. 28, 2012
Restricted Stock Units
Jan. 30, 2012
Restricted Stock Units
Jan. 31, 2012
Independent directors
Restricted Stock Units
Stock-Based Incentive Plans                        
Number of stock-based incentive plans 1                      
Number of stock option plans superseded 2                      
Restricted stock unit activity                        
Awarded (in shares)               361,061 361,000     8,550
Vested (in shares)                 (95,000)      
Forfeited (in shares)                 (1,000)      
Outstanding at the end of the period (in shares)                 265,000      
Outstanding and expected to vest at the end of the period (in shares)                 257,000      
Black-Scholes option pricing model assumptions for options granted                        
Risk Free Interest Rate (as a percent)       2.62%     2.92%          
Dividend Yield (as a percent)       1.75%     1.76%          
Expected Life       6 years 2 months 12 days     6 years 7 months 6 days          
Volatility (as a percent)       39.00%     38.00%          
Exercise Price (in dollars per share)         $ 29.66 $ 32.63 $ 29.58          
Weighted Average Fair Value (in dollars per share)       $ 10.33     $ 10.49          
Non-Qualified Stock Options activity                        
Outstanding at the beginning of the period (in shares) 2,134,000                      
Exercised (in shares) (90,000)                      
Forfeited (in shares) (24,000)                      
Outstanding at the end of the period (in shares) 2,020,000                      
Outstanding and expected to vest at the end of the period (in shares) 1,977,000                      
Exercisable at the end of the period (in shares) 1,100,000                      
Weighted-Average Exercise Price                        
Outstanding at the beginning of the period (in dollars per share) $ 31.15                   $ 33.23  
Awarded (in dollars per share)                 $ 33.23      
Vested (in dollars per share)                 $ 33.23      
Exercised (in dollars per share) $ 24.16                      
Forfeited (in dollars per share) $ 35.97               $ 33.23      
Outstanding at the end of the period (in dollars per share) $ 31.41               $ 33.23   $ 33.23  
Outstanding and expected to vest at end of the period (in dollars per share) $ 31.45               $ 33.23      
Exercisable at end of the period (in dollars per share) $ 33.15                      
Weighted-Average Remaining Contractual Life                        
Outstanding and expected to vest at end of the period 4 years                      
Exercisable at end of the period 3 years 1 month 6 days                      
Aggregate Intrinsic Value                        
Outstanding at the end of the period (in dollars) $ 846,000               $ 7,593,000      
Outstanding and expected to vest at end of the period (in dollars) $ 832,000               $ 7,367,000      
Exercisable at end of the period (in dollars) 590,000                      
Closing price of share (in dollars per share)     $ 28.62             $ 28.62    
Total intrinsic value of RSUs vested (in dollars) $ 800,000 $ 40,000             $ 3,100,000      
Number of Shares, Unvested Stock Options                        
Unvested at the beginning of the period (in shares) 1,242,000                      
Vested (in shares) (319,000)                      
Forfeiture (in shares) (3,000)                      
Unvested at the end of the period (in shares) 920,000                      
Weighted-Average Grant-Date Fair Value, Unvested Stock Options                        
Unvested at the beginning of the period (in dollars per share) $ 10.11                      
Vested (in dollars per share) $ 9.86                      
Forfeiture (in dollars per share) $ 10.33                      
Unvested at the end of the period (in dollars per share) $ 10.19                      
Unrecognized compensation cost and vesting period                        
Unrecognized compensation costs related to unvested share-based compensation arrangements $ 19,800,000                      
Weighted-average period for recognition of unrecognized stock-based compensation expense 2 years 3 months 18 days                      
Period over which award restrictions lapse with one quarter on award date and one quarter on each anniversary date               3 years