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Stock-Based Compensation - Summary of Company's Restricted Performance Stock Unit Activity (Details) - Restricted Stock Units (RSUs)
shares in Thousands
9 Months Ended
Sep. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested shares outstanding, balance (in shares) 222
Granted (in shares) 97
Vested (earned) (in shares) (57)
Forfeited (in shares) (5)
Non-vested shares outstanding, balance (in shares) 257