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Stock-Based Compensation - Stock Options (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Options (in shares):    
Outstanding beginning of the period (in shares) | shares 2,903,167  
Granted (in shares) | shares 0  
Forfeited (in shares) | shares (6,380)  
Exercised (in shares) | shares (629,755)  
Outstanding end of the period (in shares) | shares 2,267,032 2,903,167
Exercisable (in shares) | shares 2,259,753  
Weighted-Average Exercise Price (in dollars per share):    
Outstanding beginning of the period (in dollars per share) | $ / shares $ 14.48  
Granted (in dollars per share) | $ / shares 0  
Forfeited (in dollars per share) | $ / shares 19.25  
Exercised (in dollars per share) | $ / shares 13.96  
Outstanding end of the period (in dollars per share) | $ / shares 14.61 $ 14.48
Exercisable (in dollars per share) | $ / shares $ 14.59  
Outstanding, weighted-average remaining contractual term (years) 4 years 1 month 6 days 4 years 8 months 12 days
Exercisable, weighted-average remaining contractual term (years) 4 years 1 month 6 days