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Share-based Compensation, PSU (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 08, 2019
Mar. 31, 2020
Mar. 26, 2019
Share-based Compensation      
Intrinsic value of awards vested (in dollars)   $ 3,300 $ 7,200
Expense compensation   $ 7,247 $ 9,132
PSUs      
Share-based Compensation      
Vesting period   1 year  
Vested (in shares) (95,946)    
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