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Stock Based Compensation (Narrative) (Details) (USD $)
 4 Months Ended 4 Months Ended 4 Months Ended 3 Months Ended 4 Months Ended
Apr. 21, 2012
Dec. 31, 2011
Apr. 21, 2012
Stock Options [Member]
Y
Apr. 21, 2012
Stock Appreciation Rights [Member]
Y
Dec. 31, 2011
Stock Appreciation Rights [Member]
Apr. 21, 2012
Restricted Stock Awards [Member]
Y
Apr. 21, 2012
Deferred Stock [Member]
Apr. 21, 2012
Performance-Contingent Restricted Stock [Member]
Apr. 21, 2012
TSR Rank Less Than 50th Percentile Of S&P TSR [Member]
Apr. 21, 2012
TSR Rank Less Than 50th Percentile Of S&P TSR [Member]
Restricted Stock Awards [Member]
Apr. 21, 2012
TSR Rank Greater Than 50th Percentile Of S&P TSR [Member]
Apr. 21, 2012
Maximum [Member]
Stock Appreciation Rights [Member]
Apr. 21, 2012
Minimum [Member]
Stock Appreciation Rights [Member]
Jul. 16, 2011
Non-Employee Directors [Member]
Deferred Stock [Member]
Apr. 23, 2011
Non-Employee Directors [Member]
Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Aggregate number of shares that may be issued or transferred under EPIP 27,937,500                            
Unrecognized compensation cost related to share based compensation     $ 4,200,000       $ 500,000 $ 2,000,000              
Expected weighted-average period to recognize compensation cost (years)     1.50     0.80                  
Return on investment target over the two fiscal years immediately preceding the vesting date               3.75%              
Number of shares vested to plan participants                213,271              
Maximum percentage of change in grant                 (20.00%)   20.00%        
Reduction in grant, percentage                   16.90%          
Reduction in grant, common shares                   43,490          
Percentage of change in grant                 (1.30%)   1.30%        
Deferred shares exercised for retainer conversions             20,205                
Maximum percentage of award, declared as dividends               100.00%              
Dividends paid on vested performance-contingent restricted stock awards 234,000             200,000              
Total fair value of shares vested           3,400,000                  
Fair value of rights                       $ 20.59 $ 9.03    
Dividend yield       3.00%                      
Expected volatility       29.00%                      
Risk-free interest rate       0.84%                      
Expected life, minimum (years)       0.30                      
Expected life, maximum (years)       2.05                      
Vesting period, minimum (years)             two               one
Aggregate shares converted             18,330             50,400  
Exercise period (years)     2                        
Vesting period       1 year     2 years 1 year              
Exercisable period       9 years                      
Other long-term liabilities $ 49,730,000 $ 52,567,000   $ 2,700,000 $ 2,300,000