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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
May 24, 2016
May 22, 2007
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized pre-tax compensation cost     $ 3,200    
Weighted average recognition period (in years)     2 years 1 month 15 days    
Total intrinsic value of options exercised during period     $ 3,400 $ 6,800  
Cash received from options exercised during period     $ 1,300 $ 2,500  
New Accounting Pronouncement, Early Adoption, Effect [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cumulative effect of new accounting principle in period of adoption         $ 150
1992 Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock authorized to be issued under plan (in shares)     14,900,000    
Exercise price of shares granted may not be less than fair market value (percentage)     85.00%    
2007 Long-Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock authorized to be issued under plan (in shares) 400,000.0 3,281,250      
Unrecognized pre-tax compensation cost     $ 6,500    
Weighted average recognition period (in years)     2 years 15 days    
2007 Long-Term Incentive Plan Employees [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercise price of shares granted may not be less than fair market value (percentage)   100.00%      
2016 Long-Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock authorized to be issued under plan (in shares) 3,800,000.0        
Exercise price of shares granted may not be less than fair market value (percentage) 100.00%        
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercisable period     2 years    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercisable period     10 years    
Restricted Stock [Member] | 2007 Long-Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting period     20.00%    
All Other Options Granted [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting period     20.00%    
Director [Member] | Options Granted on or after May 25, 2004 [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting period     33.33%