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Stockholders' Equity and Stock-Based Compensation - Summary of Restricted Stock Award and Restricted Stock Unit Activity (Details)
shares in Thousands
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Restricted Stock Awards  
Number of restricted shares  
Balance, beginning (in shares) | shares 459
Granted (in shares) | shares 310
Vested (in shares) | shares (116)
Balance, ending (in shares) | shares 653
Weighted average exercise price  
Balance, beginning (in dollars per share) | $ / shares $ 20.49
Granted (in dollars per share) | $ / shares 22.54
Vested (in dollars per share) | $ / shares 21.41
Balance, ending (in dollars per share) | $ / shares $ 21.30
Restricted Stock Units  
Number of restricted shares  
Balance, beginning (in shares) | shares 2,407
Granted (in shares) | shares 1,150
Vested (in shares) | shares (400)
Forfeited & modified (in shares) | shares (75)
Balance, ending (in shares) | shares 3,082
Weighted average exercise price  
Balance, beginning (in dollars per share) | $ / shares $ 19.47
Granted (in dollars per share) | $ / shares 21.60
Vested (in dollars per share) | $ / shares 21.66
Forfeited & modified (in dollars per share) | $ / shares 20.19
Balance, ending (in dollars per share) | $ / shares $ 19.96