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Accounting for Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 01, 2017
Mar. 01, 2016
Mar. 31, 2017
Common Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Price     $ 8.87
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards     $ 0
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Shares     110,988
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     one-third increments on each of the first three anniversaries of the award date
Granted, Shares     1,323,000
Restricted Stock and Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards     $ 36,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     24 months
Restricted Stock, Performance-Based Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     one-third increments on each of the first three anniversaries of the award date
Plan 2000 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     one-third increments on each of the first three anniversaries of the award date
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     0
Plan 2009 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     one-third increments on each of the first three anniversaries of the award date
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     3,941,664
Plan 2009 [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     one-third increments on each of the first three anniversaries of the award date
Fair value of units granted $ 170,000 $ 170,000  
Share-based Compensation, Number of Shares Received by Each Director 18,498 11,017  
Contractual Term of Option Granted Prior to 2005 [Member] | Plan 2000 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Contractual Term of Option Granted     10 years
Contractual Term of Option Granted From 2005 Through 2007 [Member] | Plan 2000 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Contractual Term of Option Granted     8 years
Contractual Term Of Option Granted From 2008 Through 2011 [Member] | Plan 2000 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Contractual Term of Option Granted     10 years
Contractual Term of Option Granted in 2011 or Later [Member] | Plan 2009 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Contractual Term of Option Granted     10 years