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Employee Benefits and Share-Based Compensation - Summary of Performance-Based Restricted Stock Activity (Details) - Performance-Based Restricted Stock - 2009 Plan
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 155
Granted (Awarded) (in shares) | shares 51
Vested (Released) (in shares) | shares (41)
Forfeited (in shares) | shares (6)
Outstanding and unvested at end of period (in shares) | shares 159
Weighted-Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 74.26
Granted (Awarded) (in dollars per share) | $ / shares 156.79
Vested (Released) (in dollars per share) | $ / shares 70.60
Forfeited (in dollars per share) | $ / shares 63.20
Outstanding and unvested at end of period (in dollars per share) | $ / shares $ 102.21