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Stock-Based Compensation Expense - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 22, 2020
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation   $ 3,595 $ 2,777
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted in period (in shares)   125,850 216,494
Compensation cost not yet recognized   $ 22,400  
Compensation cost not yet recognized, period of recognition   2 years 6 months  
Stock-Settled Performance-Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   1 year  
Compensation cost not yet recognized   $ 6,500  
Compensation cost not yet recognized, period of recognition   2 years 1 month 6 days  
Stock-Settled Performance-Based Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units granted in period (in shares)   128,883 127,060
Cash-settled share-based awards ("Liability Awards")      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target cash incentive   $ 1,000 $ 1,000
Compensation cost not yet recognized   $ 2,400  
Compensation cost not yet recognized, period of recognition   2 years 1 month 6 days  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option contractual life   1 year  
Compensation cost not yet recognized   $ 300  
Restricted Stock Units | Non-employee members      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted (in shares) 33,504