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Share Based Compensation - PSU (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 08, 2021
Jun. 29, 2021
Jun. 30, 2020
Jun. 29, 2021
Jun. 30, 2020
Share-based Compensation          
Expense compensation   $ 9,909 $ 7,243 $ 19,817 $ 14,490
PSUs          
Share-based Compensation          
Vesting period       1 year  
Intrinsic value of awards vested (in dollars)   0 $ 0 $ 400 $ 5,400
Vested (in shares) (5,199)        
Expense compensation   1,800   4,100  
Unrecognized compensation cost of unvested stock awards (in dollars)   $ 3,800   $ 3,800  
Unrecognized Compensation Cost Recognized Weighted Average Period       6 months