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Stock-Based Compensation - Liability Classified Awards - Cash-settled Restricted Stock Units (Details) - Cash-Settled Restricted Stock Units
6 Months Ended
Jun. 30, 2021
shares
Restricted Stock  
Beginning of period (in shares) 52,956
Released (in shares) (38,916)
Forfeited (in shares) (740)
End of period (in shares) 13,300