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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
May 24, 2016
May 22, 2007
Jun. 30, 2019
Jun. 30, 2018
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        
Unrecognized pre-tax compensation cost     $ 29,100    
Weighted average recognition period (in years)     4 years    
Total intrinsic value of options exercised during period     $ 5,000 $ 3,200  
Cash received from options exercised during period     7,685 $ 2,299  
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 3,300,000      
Exercise price of shares granted may not be less than fair market value (percentage)   100.00%      
Award vesting period   5 years      
Unrecognized pre-tax compensation cost     $ 8,500    
Weighted average recognition period (in years)     3 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       2,600,000
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%