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Share-based Compensation, PSU (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 08, 2019
Jun. 30, 2020
Jun. 25, 2019
Jun. 30, 2020
Jun. 25, 2019
Share-based Compensation          
Intrinsic value of awards vested (in dollars)       $ 5,400 $ 8,800
Expense compensation   $ 7,243 $ 7,741 $ 14,490 $ 16,873
PSUs          
Share-based Compensation          
Vesting period       1 year  
Vested (in shares) (95,946) 0 0    
Granted (in shares) 77,000        
Incremental Performance Shares (in shares) 18,946        
Target percentage relating to shares granted (as a percent)       100.00%  
Expense compensation       $ 0  
Unrecognized compensation cost of unvested stock awards (in dollars)   $ 0   $ 0