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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
May 24, 2016
May 22, 2007
Jun. 30, 2018
Jun. 30, 2017
May 15, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock authorized to be issued under plan (in shares) 6,400,000.0        
Unrecognized pre-tax compensation cost     $ 17,300    
Weighted average recognition period (in years)     2 years 6 months    
Total intrinsic value of options exercised during period     $ 3,200 $ 4,000  
Cash received from options exercised during period     2,299 $ 1,573  
2007 Long-Term Incentive Plan          
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      
Exercise price of shares granted may not be less than fair market value (percentage)   100.00%      
Unrecognized pre-tax compensation cost     $ 7,600    
Weighted average recognition period (in years)     2 years    
2016 Long-Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock authorized to be issued under plan (in shares) 3,400,000.0       2,600,000.0
Exercise price of shares granted may not be less than fair market value (percentage) 100.00%        
Restricted Stock | 2007 Long-Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting period     20.00%    
Director | Options Granted on or after May 25, 2004 | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting period     33.33%