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Stockholders' Equity - Common Stock Outstanding Activity (Details)
shares in Thousands
9 Months Ended
Sep. 30, 2021
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]  
Shares of common stock outstanding beginning period (in shares) 61,005
Restricted stock awards, net of forfeitures (in shares) 609
Shares withheld for taxes on vesting of stock awards and transferred to treasury (in shares) (238)
Shares of common stock outstanding ending period (in shares) 61,376