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Share Based Compensation - PSU (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 08, 2021
Mar. 30, 2021
Mar. 31, 2020
Share-based Compensation      
Expense compensation   $ 9,908 $ 7,247
PSUs      
Share-based Compensation      
Vesting period   1 year  
Intrinsic value of awards vested (in dollars)   $ 400 $ 3,300
Vested (in shares) (5,199)    
Expense compensation   2,300  
Unrecognized compensation cost of unvested stock awards (in dollars)   $ 3,300  
Unrecognized Compensation Cost Recognized Weighted Average Period   9 months 18 days