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Accounting for Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 01, 2018
USD ($)
shares
Mar. 01, 2017
USD ($)
shares
Mar. 31, 2018
USD ($)
item
$ / shares
shares
Mar. 31, 2017
USD ($)
item
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate intrinsic value of options exercised | $     $ 0 $ 0
Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Price | $ / shares     $ 3.96  
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  
Employee Service Share-based Compensation, Nonvested Awards, Modifications to Awards | item     0 0
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  
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 | $     $ 21,000  
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  
Share-based Compensation Arrangement by Share-based Payment Award, Performance Objective Measurement Period     3 years  
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 | shares     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 | shares     1,527,880  
Plan 2009 [Member] | Restricted Stock and Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of units granted | $ $ 170 $ 170    
Share-based Compensation, Number of Shares Received by Each Director | shares 37,118 18,498    
Plan 2009 Amended and Restated [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares     7,000,000  
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