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Stock-Based Compensation - Liability Classified Awards - Cash-settled Restricted Stock Units (Details) - Cash-settled Restricted Stock Units
3 Months Ended
Mar. 31, 2021
shares
Restricted Stock  
Beginning of period (in shares) 52,956
Released (in shares) (38,171)
Forfeited (in shares) (54)
End of period (in shares) 14,731