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Employee Benefit Plans (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
years
Dec. 25, 2010
Dec. 26, 2009
Dec. 27, 2008
Defined Benefit Plan Disclosure [Line Items]        
Stock option grants, exercise price, minimum percentage on fair market value 100.00%      
Stock option exercisable period, minimum, in years one      
Stock option exercisable period, maximum, in years five      
Option exchange, exercise price of new options $ 6.90      
Weighted average grant date fair values of options granted $ 2.25 3.89 0.69  
Risk-free interest rate 1.97% 2.30% 2.10%  
Expected life, years 4.5 4.5 4.5  
Dividend yield 0.00% 0.00% 0.00%  
Expected volatility rate, minimum 67.00% 64.00% 70.00%  
Expected volatility rate, maximum 77.00% 73.00% 118.00%  
Anticipated rate of forfeitures against actual 5.00%      
Intrinsic value of options exercised $ 3,800,000 11,900,000 0  
Stock-based compensation expense not yet recognized relating to non-vested awards 11,100,000      
Stock-based compensation expense relating to non-vested awards, weighted-average recognition period, years 1.9      
Number of unvested shares 8,300,000      
Number of shares estimated to vest 7,900,000      
Percentage of shares expected to vest 95.00%      
Number of exercisable shares 10,800,000 8,300,000    
Matching contribution by employer percentage 50.00%      
Contribution by participants percentage 4.00%      
Compensation expense relating to retirement savings plans 7,200,000 80,200 1,100,000  
Deferred (loss) gain included in OCI (1,000,000) 6,000,000    
Accumulated benefit obligations 182,364,000 177,195,000 192,131,000  
Percentage of allowances on assets 0.50%      
Stock Option Exchange Program [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Number of eligible options for exchange   3,800,000    
Number of new options issued in exchange of old options   1,400,000    
Option exchange, exercise price of new options   5.13    
Vesting period (in years)   three    
Fair value of exchanged shares (per share)   2.97    
Restricted Stock [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Number of share grants awarded to new chairman 2      
Shares granted in period 2,890,943 173,387 21,628  
Vesting period (in years) three      
Stock-based compensation expense not yet recognized relating to non-vested awards 6,800,000      
Stock-based compensation expense relating to non-vested awards, weighted-average recognition period, years 2      
Nonvested shares 2,612,876 496,059 1,318,162 2,663,216
Future vestible shares 2,300,000      
Grant date fair value of shares vested 5,300,000      
First Grant [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Vesting period (in years) three      
Share Awarded To New Chairman [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Shares granted in period 600,000      
Share Awarded For Service First Grant [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Shares granted in period 600,000      
Share Awarded For Service Second Grant [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Shares granted in period 600,000      
Share Granted To Directors As Compensation [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Shares granted in period 256,441      
Contribution For European Employees [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Compensation expense relating to retirement savings plans $ 5,000,000 4,700,000 4,900,000  
U.K. Government Securities [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Excess rate of return on equity over government securities 4.00%      
Maximum [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Stock options expiration period ten